Small typo fixes in comments.

Why see the same message twice?

CHANGELOG.md

@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file.
 
 ## Unreleased - ???
 - Documentation fixes
+- ev/thread-chan deadlock bug fixed
+- Re-add removed support for non-blocking net/connect on windows.
 
 ## 1.41.2 - 2026-02-18
 - Fix regressions in `put` for arrays and buffers.

CONTRIBUTING.md

@@ -37,6 +37,12 @@ may require changes before being merged.
   do this indentation, or approximate as close as possible. There is a janet formatter
   in [spork](https://github.com/janet-lang/spork.git) that can be used to format code as well.
 
+Bot pull requests will not be accepted, and anonymous submissions, including
+new accounts, unknown emails, and first time contributors will be subjected
+to greater scrutiny and code reivew. Automatically generated and filed bug
+reports MAY be ok, if they are of consistent and good quality, such as
+OSSFuzz or well constructed CI pipelines.
+
 ## C style
 
 For changes to the VM and Core code, you will probably need to know C. Janet is programmed with
@@ -90,3 +96,18 @@ timely manner. In short, if you want extra functionality now, then build it.
 
 * Include a good description of the problem that is being solved
 * Include descriptions of potential solutions if you have some in mind.
+
+## LLMs, Tool Usage, and Transparency
+
+All usage of Large Language Models (LLMs), Neural Networks, "AI" tools, and
+other tools such as software fuzzers or static analyzers must be disclosed.
+This applies to pull requests, email patches, bug reports, and any other
+meaningful contribution to Janet's source code. Please also refrain from using
+generative AI for code that will be embedded in the Janet runtime, which include
+all C source files as well as boot.janet. All code should be well
+and completely understood by the human author, including test cases. Large and
+obviously AI-driven changes will be rejected. Be mindful and transparent on the
+copyright implications of any submitted code. We will use discretion when
+accepting generated test cases for bug reproductions, one-line bug
+fixes, or typo fixes. Often, these can be trivially rewritten by a human to
+avoid the problem.

examples/error.janet

@@ -3,10 +3,10 @@
 
 (defn bork [x]
 
-  (defn bark [x]
+  (defn bark [y]
     (print "Woof!")
-    (print x)
-    (error x)
+    (print y)
+    (error y)
     (print "Woof!"))
 
   (bark (* 2 x))

examples/iterate-fiber.janet

@@ -7,13 +7,13 @@
 (print "simple yielding")
 (each item f (print "got: " item ", now " (fiber/status f)))
 
-(def f
+(def f2
   (coro
     (for i 0 10
       (yield (string "yield " i))
       (ev/sleep 0))))
 
 (print "complex yielding")
-(each item f (print "got: " item ", now " (fiber/status f)))
+(each item f2 (print "got: " item ", now " (fiber/status f2)))
 
-(print (fiber/status f))
+(print (fiber/status f2))

examples/lazyseqs.janet

@@ -4,7 +4,7 @@
 # that must be called (realizing it), and the memoized.
 # Use with (import "./path/to/this/file" :prefix "seq.")
 
-(defmacro delay
+(defmacro dolazy
   "Lazily evaluate a series of expressions. Returns a function that
   returns the result of the last expression. Will only evaluate the
   body once, and then memoizes the result."
@@ -35,7 +35,7 @@
   (def x (tuple h t))
   (fn [] x))
 
-(defn empty?
+(defn lazy-empty?
   "Check if a sequence is empty."
   [s]
   (not (s)))
@@ -55,14 +55,14 @@
   [start end &]
   (if end
     (if (< start end)
-      (delay (tuple start (lazy-range (+ 1 start) end)))
+      (dolazy (tuple start (lazy-range (+ 1 start) end)))
       empty-seq)
     (lazy-range 0 start)))
 
 (defn lazy-map
   "Return a sequence that is the result of applying f to each value in s."
   [f s]
-  (delay
+  (dolazy
     (def x (s))
     (if x (tuple (f (get x HEAD)) (map f (get x TAIL))))))
 
@@ -76,31 +76,31 @@
   [f s]
   (when (s) (f (head s)) (realize-map f (tail s))))
 
-(defn drop
+(defn lazy-drop
   "Ignores the first n values of the sequence and returns the rest."
   [n s]
-  (delay
+  (dolazy
     (def x (s))
-    (if (and x (pos? n)) ((drop (- n 1) (get x TAIL))))))
+    (if (and x (pos? n)) ((lazy-drop (- n 1) (get x TAIL))))))
 
-(defn take
+(defn lazy-take
   "Returns at most the first n values of s."
   [n s]
-  (delay
+  (dolazy
     (def x (s))
     (if (and x (pos? n))
-      (tuple (get x HEAD) (take (- n 1) (get x TAIL))))))
+      (tuple (get x HEAD) (lazy-take (- n 1) (get x TAIL))))))
 
 (defn randseq
   "Return a sequence of random numbers."
   []
-  (delay (tuple (math/random) (randseq))))
+  (dolazy (tuple (math/random) (randseq))))
 
-(defn take-while
+(defn lazy-take-while
   "Returns a sequence of values until the predicate is false."
   [pred s]
-  (delay
+  (dolazy
     (def x (s))
     (when x
       (def thehead (get HEAD x))
-      (if thehead (tuple thehead (take-while pred (get TAIL x)))))))
+      (if thehead (tuple thehead (lazy-take-while pred (get TAIL x)))))))

examples/life.janet

@@ -16,8 +16,8 @@
   (def cell-set (frequencies state))
   (def neighbor-set (frequencies (mapcat neighbors state)))
   (seq [coord :keys neighbor-set
-         :let [count (get neighbor-set coord)]
-         :when (or (= count 3) (and (get cell-set coord) (= count 2)))]
+         :let [ncount (get neighbor-set coord)]
+         :when (or (= ncount 3) (and (get cell-set coord) (= ncount 2)))]
       coord))
 
 (defn draw

src/boot/boot.janet

@@ -46,7 +46,6 @@
 (defn defmacro :macro :flycheck
   "Define a macro."
   [name & more]
-  (setdyn name @{}) # override old macro definitions in the case of a recursive macro
   (apply defn name :macro more))
 
 (defmacro as-macro
@@ -219,9 +218,9 @@
 
 (defmacro default
   ``Define a default value for an optional argument.
-  Expands to `(def sym (if (= nil sym) val sym))`.``
+  Expands to `(def sym :shadow (if (= nil sym) val sym))`.``
   [sym val]
-  ~(def ,sym (if (,= nil ,sym) ,val ,sym)))
+  ~(def ,sym :shadow (if (,= nil ,sym) ,val ,sym)))
 
 (defmacro comment
   "Ignores the body of the comment."
@@ -443,11 +442,36 @@
      (def ,binding ,ctor)
      ,(defer-impl :with [(or dtor :close) binding] body)))
 
+# declare ahead of time
+(var- macexvar nil)
+
+(defmacro if-let
+  ``Make multiple bindings, and if all are truthy,
+  evaluate the `tru` form. If any are false or nil, evaluate
+  the `fal` form. Bindings have the same syntax as the `let` macro.``
+  [bindings tru &opt fal]
+  (def len (length bindings))
+  (if (= 0 len) (error "expected at least 1 binding"))
+  (if (odd? len) (error "expected an even number of bindings"))
+  (def fal2 (if macexvar (macexvar fal) fal))
+  (defn aux [i]
+    (if (>= i len)
+      tru
+      (do
+        (def bl (in bindings i))
+        (def br (in bindings (+ 1 i)))
+        (if (symbol? bl)
+          ~(if (def ,bl ,br) ,(aux (+ 2 i)) ,fal2)
+          ~(if (def ,(def sym (gensym)) ,br)
+             (do (def ,bl ,sym) ,(aux (+ 2 i)))
+             ,fal2)))))
+  (aux 0))
+
 (defmacro when-with
   ``Similar to with, but if binding is false or nil, returns
   nil without evaluating the body. Otherwise, the same as `with`.``
   [[binding ctor dtor] & body]
-  ~(if-let [,binding ,ctor]
+  ~(as-macro ,if-let [,binding ,ctor]
      ,(defer-impl :when-with [(or dtor :close) binding] body)))
 
 (defmacro if-with
@@ -455,7 +479,7 @@
   the falsey path. Otherwise, evaluates the truthy path. In both cases,
   `ctor` is bound to binding.``
   [[binding ctor dtor] truthy &opt falsey]
-  ~(if-let [,binding ,ctor]
+  ~(as-macro ,if-let [,binding ,ctor]
      ,(defer-impl :if-with [(or dtor :close) binding] [truthy])
      ,falsey))
 
@@ -539,13 +563,13 @@
         (case binding
           :until ~(do (if ,verb (break) nil) ,rest)
           :while ~(do (if ,verb nil (break)) ,rest)
-          :let ~(let ,verb (do ,rest))
+          :let ~(as-macro ,let ,verb (do ,rest))
           :after ~(do ,rest ,verb nil)
           :before ~(do ,verb ,rest nil)
           :repeat (with-syms [iter]
-                    ~(do (var ,iter ,verb) (while (> ,iter 0) ,rest (-- ,iter))))
-          :when ~(when ,verb ,rest)
-          :unless ~(unless ,verb ,rest)
+                    ~(do (var ,iter ,verb) (while (,> ,iter 0) ,rest (as-macro ,-- ,iter))))
+          :when ~(as-macro ,when ,verb ,rest)
+          :unless ~(as-macro ,unless ,verb ,rest)
           (error (string "unexpected loop modifier " binding))))))
 
   # 3 term expression
@@ -587,7 +611,7 @@
   "Evaluate body n times. If n is negative, body will be evaluated 0 times. Evaluates to nil."
   [n & body]
   (with-syms [iter]
-    ~(do (var ,iter ,n) (while (> ,iter 0) ,;body (-- ,iter)))))
+    ~(do (var ,iter ,n) (while (,> ,iter 0) ,;body (as-macro ,-- ,iter)))))
 
 (defmacro forever
   "Evaluate body forever in a loop, or until a break statement."
@@ -683,7 +707,7 @@
   [head & body]
   (def $accum (gensym))
   (check-empty-body body)
-  ~(do (def ,$accum @[]) (loop ,head (,array/push ,$accum (do ,;body))) ,$accum))
+  ~(do (def ,$accum @[]) (as-macro ,loop ,head (,array/push ,$accum (do ,;body))) ,$accum))
 
 (defmacro catseq
   ``Similar to `loop`, but concatenates each element from the loop body into an array and returns that.
@@ -691,21 +715,21 @@
   [head & body]
   (def $accum (gensym))
   (check-empty-body body)
-  ~(do (def ,$accum @[]) (loop ,head (,array/concat ,$accum (do ,;body))) ,$accum))
+  ~(do (def ,$accum @[]) (as-macro ,loop ,head (,array/concat ,$accum (do ,;body))) ,$accum))
 
 (defmacro tabseq
   ``Similar to `loop`, but accumulates key value pairs into a table.
   See `loop` for details.``
   [head key-body & value-body]
   (def $accum (gensym))
-  ~(do (def ,$accum @{}) (loop ,head (,put ,$accum ,key-body (do ,;value-body))) ,$accum))
+  ~(do (def ,$accum @{}) (as-macro ,loop ,head (,put ,$accum ,key-body (do ,;value-body))) ,$accum))
 
 (defmacro generate
   ``Create a generator expression using the `loop` syntax. Returns a fiber
   that yields all values inside the loop in order. See `loop` for details.``
   [head & body]
   (check-empty-body body)
-  ~(,fiber/new (fn :generate [] (loop ,head (yield (do ,;body)))) :yi))
+  ~(,fiber/new (fn :generate [] (as-macro ,loop ,head (,yield (do ,;body)))) :yi))
 
 (defmacro coro
   "A wrapper for making fibers that may yield multiple values (coroutine). Same as `(fiber/new (fn [] ;body) :yi)`."
@@ -754,35 +778,10 @@
   (each x xs (*= accum x))
   accum)
 
-# declare ahead of time
-(var- macexvar nil)
-
-(defmacro if-let
-  ``Make multiple bindings, and if all are truthy,
-  evaluate the `tru` form. If any are false or nil, evaluate
-  the `fal` form. Bindings have the same syntax as the `let` macro.``
-  [bindings tru &opt fal]
-  (def len (length bindings))
-  (if (= 0 len) (error "expected at least 1 binding"))
-  (if (odd? len) (error "expected an even number of bindings"))
-  (def fal2 (if macexvar (macexvar fal) fal))
-  (defn aux [i]
-    (if (>= i len)
-      tru
-      (do
-        (def bl (in bindings i))
-        (def br (in bindings (+ 1 i)))
-        (if (symbol? bl)
-          ~(if (def ,bl ,br) ,(aux (+ 2 i)) ,fal2)
-          ~(if (def ,(def sym (gensym)) ,br)
-             (do (def ,bl ,sym) ,(aux (+ 2 i)))
-             ,fal2)))))
-  (aux 0))
-
 (defmacro when-let
   "Same as `(if-let bindings (do ;body))`."
   [bindings & body]
-  ~(if-let ,bindings (do ,;body)))
+  ~(as-macro ,if-let ,bindings (do ,;body)))
 
 (defn comp
   `Takes multiple functions and returns a function that is the composition
@@ -1432,7 +1431,7 @@
                  (tuple n @[])))
     (def sym (gensym))
     (def parts (array/concat @[h sym] t))
-    ~(let [,sym ,last] (if ,sym ,(keep-syntax! n parts))))
+    ~(as-macro ,let [,sym ,last] (if ,sym ,(keep-syntax! n parts))))
   (reduce fop x forms))
 
 (defmacro -?>>
@@ -1448,7 +1447,7 @@
                  (tuple n @[])))
     (def sym (gensym))
     (def parts (array/concat @[h] t @[sym]))
-    ~(let [,sym ,last] (if ,sym ,(keep-syntax! n parts))))
+    ~(as-macro ,let [,sym ,last] (if ,sym ,(keep-syntax! n parts))))
   (reduce fop x forms))
 
 (defn- walk-ind [f form]
@@ -2411,8 +2410,8 @@
       (dictionary? m) (merge-into metadata m)
       (error (string "invalid metadata " m))))
   (with-syms [entry old-entry f]
-    ~(let [,old-entry (,dyn ',name)]
-       (def ,entry (or ,old-entry @{:ref @[nil]}))
+    ~(as-macro ,let [,old-entry (,dyn ',name)]
+       (def ,entry (as-macro ,or ,old-entry @{:ref @[nil]}))
        (,setdyn ',name ,entry)
        (def ,f ,fbody)
        (,put-in ,entry [:ref 0] ,f)
@@ -2675,17 +2674,17 @@
     (var resumeval nil)
     (def f
       (fiber/new
-        (fn []
+        (fn :compile-and-lint []
           (array/clear lints)
           (def res (compile source env where lints))
-          (unless (empty? lints)
+          (when (next lints)
             # Convert lint levels to numbers.
             (def levels (get env *lint-levels* lint-levels))
             (def lint-error (get env *lint-error*))
             (def lint-warning (get env *lint-warn*))
             (def lint-error (or (get levels lint-error lint-error) 0))
             (def lint-warning (or (get levels lint-warning lint-warning) 2))
-            (each [level line col msg] lints
+            (each [level line col msg] (distinct lints) # some macros might cause code to be duplicated. Avoid repeated messages.
               (def lvl (get lint-levels level 0))
               (cond
                 (<= lvl lint-error) (do
@@ -3953,7 +3952,7 @@
     ``
     [sec & body]
     (with-syms [f]
-      ~(let [,f (coro ,;body)]
+      ~(as-macro ,let [,f (as-macro ,coro ,;body)]
          (,ev/deadline ,sec nil ,f)
          (,resume ,f))))
 
@@ -4085,15 +4084,15 @@
     (defn make-ptr []
       (assertf (ffi/lookup (if lazy (llib) lib) raw-symbol) "failed to find ffi symbol %v" raw-symbol))
     (if lazy
-      ~(defn ,alias ,;meta [,;formal-args]
+      ~(as-macro ,defn ,alias ,;meta [,;formal-args]
          (,ffi/call (,(delay (make-ptr))) (,(delay (make-sig))) ,;formal-args))
-      ~(defn ,alias ,;meta [,;formal-args]
+      ~(as-macro ,defn ,alias ,;meta [,;formal-args]
          (,ffi/call ,(make-ptr) ,(make-sig) ,;formal-args))))
 
   (defmacro ffi/defbind :flycheck
     "Generate bindings for native functions in a convenient manner."
     [name ret-type & body]
-    ~(ffi/defbind-alias ,name ,name ,ret-type ,;body)))
+    ~(as-macro ,ffi/defbind-alias ,name ,name ,ret-type ,;body)))
 
 ###
 ###

src/core/asm.c

@@ -1110,6 +1110,7 @@ JANET_CORE_FN(cfun_disasm,
         if (!janet_cstrcmp(kw, "structarg")) return janet_disasm_structarg(f->def);
         if (!janet_cstrcmp(kw, "namedargs")) return janet_disasm_namedargs(f->def);
         if (!janet_cstrcmp(kw, "slotcount")) return janet_disasm_slotcount(f->def);
+        if (!janet_cstrcmp(kw, "symbolmap")) return janet_disasm_symbolslots(f->def);
         if (!janet_cstrcmp(kw, "constants")) return janet_disasm_constants(f->def);
         if (!janet_cstrcmp(kw, "sourcemap")) return janet_disasm_sourcemap(f->def);
         if (!janet_cstrcmp(kw, "environments")) return janet_disasm_environments(f->def);

src/core/compile.c

@@ -91,29 +91,28 @@ void janetc_freeslot(JanetCompiler *c, JanetSlot s) {
 }
 
 /* Add a slot to a scope with a symbol associated with it (def or var). */
-void janetc_nameslot(JanetCompiler *c, const uint8_t *sym, JanetSlot s) {
+void janetc_nameslot(JanetCompiler *c, const uint8_t *sym, JanetSlot s, uint32_t flags) {
+    if (!(flags & JANET_DEFFLAG_NO_SHADOWCHECK)) {
+        if (sym[0] != '_') {
+            int check = janetc_shadowcheck(c, sym);
+            if (check == 2) {
+                janetc_lintf(c, JANET_C_LINT_NORMAL, "binding %q is shadowing a local binding", janet_wrap_symbol(sym));
+            } else if (check) {
+                janetc_lintf(c, JANET_C_LINT_NORMAL, "binding %q is shadowing a global binding", janet_wrap_symbol(sym));
+            }
+        }
+    }
     SymPair sp;
     int32_t cnt = janet_v_count(c->buffer);
     sp.sym = sym;
     sp.sym2 = sym;
     sp.slot = s;
     sp.keep = 0;
-    sp.referenced = sym[0] == '_'; /* Fake ref if symbol is _ to avoid lints */
-    sp.slot.flags |= JANET_SLOT_NAMED;
-    sp.birth_pc = cnt ? cnt - 1 : 0;
-    sp.death_pc = UINT32_MAX;
-    janet_v_push(c->scope->syms, sp);
-}
-
-/* Same as janetc_nameslot, but don't have a lint for unused bindings. */
-void janetc_nameslot_no_unused(JanetCompiler *c, const uint8_t *sym, JanetSlot s) {
-    SymPair sp;
-    int32_t cnt = janet_v_count(c->buffer);
-    sp.sym = sym;
-    sp.sym2 = sym;
-    sp.slot = s;
-    sp.keep = 0;
-    sp.referenced = 1;
+    if (flags & JANET_DEFFLAG_NO_UNUSED) {
+        sp.referenced = 1;
+    } else {
+        sp.referenced = sym[0] == '_'; /* Fake ref if symbol starts with _ to avoid lints */
+    }
     sp.slot.flags |= JANET_SLOT_NAMED;
     sp.birth_pc = cnt ? cnt - 1 : 0;
     sp.death_pc = UINT32_MAX;
@@ -260,6 +259,24 @@ static int lookup_missing(
     return 1;
 }
 
+/* Check if a binding is defined in an upper scope. This lets us check for
+ * variable shadowing. */
+int janetc_shadowcheck(JanetCompiler *c, const uint8_t *sym) {
+    /* Check locals */
+    JanetScope *scope = c->scope;
+    while (scope) {
+        int32_t len = janet_v_count(scope->syms);
+        for (int32_t i = len - 1; i >= 0; i--) {
+            SymPair *pair = scope->syms + i;
+            if (pair->sym == sym) return 2;
+        }
+        scope = scope->parent;
+    }
+    /* Check globals */
+    JanetBinding binding = janet_resolve_ext(c->env, sym);
+    return binding.type != JANET_BINDING_NONE;
+}
+
 /* Allow searching for symbols. Return information about the symbol */
 JanetSlot janetc_resolve(
     JanetCompiler *c,
@@ -1103,6 +1120,7 @@ static void janetc_init(JanetCompiler *c, JanetTable *env, const uint8_t *where,
     c->current_mapping.line = -1;
     c->current_mapping.column = -1;
     c->lints = lints;
+    c->is_redef = janet_truthy(janet_table_get_keyword(c->env, "redef"));
     /* Init result */
     c->result.error = NULL;
     c->result.status = JANET_COMPILE_OK;

src/core/compile.h

@@ -184,6 +184,9 @@ struct JanetCompiler {
 
     /* Collect linting results */
     JanetArray *lints;
+
+    /* Cached version of (dyn *redef*) */
+    int is_redef;
 };
 
 #define JANET_FOPTS_TAIL 0x10000
@@ -221,9 +224,11 @@ const JanetFunOptimizer *janetc_funopt(uint32_t flags);
 /* Get a special. Return NULL if none exists */
 const JanetSpecial *janetc_special(const uint8_t *name);
 
+#define JANET_DEFFLAG_NO_SHADOWCHECK 1
+#define JANET_DEFFLAG_NO_UNUSED 2
+
 void janetc_freeslot(JanetCompiler *c, JanetSlot s);
-void janetc_nameslot(JanetCompiler *c, const uint8_t *sym, JanetSlot s);
-void janetc_nameslot_no_unused(JanetCompiler *c, const uint8_t *sym, JanetSlot s);
+void janetc_nameslot(JanetCompiler *c, const uint8_t *sym, JanetSlot s, uint32_t flags);
 JanetSlot janetc_farslot(JanetCompiler *c);
 
 /* Throw away some code after checking that it is well formed. */
@@ -267,9 +272,12 @@ JanetFuncDef *janetc_pop_funcdef(JanetCompiler *c);
 /* Create a destroy slot */
 JanetSlot janetc_cslot(Janet x);
 
-/* Search for a symbol */
+/* Search for a symbol, and mark any found symbols as "used" for dead code elimination and linting */
 JanetSlot janetc_resolve(JanetCompiler *c, const uint8_t *sym);
 
+/* Check if a symbol is already in scope for shadowing lints */
+int janetc_shadowcheck(JanetCompiler *c, const uint8_t *sym);
+
 /* Bytecode optimization */
 void janet_bytecode_movopt(JanetFuncDef *def);
 void janet_bytecode_remove_noops(JanetFuncDef *def);

src/core/ev.c

@@ -1172,7 +1172,7 @@ JanetChannel *janet_channel_make(uint32_t limit) {
 JanetChannel *janet_channel_make_threaded(uint32_t limit) {
     janet_assert(limit <= INT32_MAX, "bad limit");
     JanetChannel *channel = janet_abstract_threaded(&janet_channel_type, sizeof(JanetChannel));
-    janet_chan_init(channel, (int32_t) limit, 0);
+    janet_chan_init(channel, (int32_t) limit, 1);
     return channel;
 }
 

src/core/pp.c

@@ -72,7 +72,7 @@ static int count_dig10(int32_t x) {
     }
 }
 
-static void integer_to_string_b(JanetBuffer *buffer, int32_t x) {
+static int32_t integer_to_string_b(JanetBuffer *buffer, int32_t x) {
     janet_buffer_extra(buffer, BUFSIZE);
     uint8_t *buf = buffer->data + buffer->count;
     int32_t neg = 0;
@@ -80,7 +80,7 @@ static void integer_to_string_b(JanetBuffer *buffer, int32_t x) {
     if (x == 0) {
         buf[0] = '0';
         buffer->count++;
-        return;
+        return 1;
     }
     if (x > 0) {
         x = -x;
@@ -96,6 +96,7 @@ static void integer_to_string_b(JanetBuffer *buffer, int32_t x) {
         x /= 10;
     }
     buffer->count += len + neg;
+    return len + neg;
 }
 
 #define HEX(i) (((uint8_t *) janet_base64)[(i)])
@@ -134,43 +135,55 @@ static void string_description_b(JanetBuffer *buffer, const char *title, void *p
 #undef POINTSIZE
 }
 
-static void janet_escape_string_impl(JanetBuffer *buffer, const uint8_t *str, int32_t len) {
+static int janet_escape_string_impl(JanetBuffer *buffer, const uint8_t *str, int32_t len) {
     janet_buffer_push_u8(buffer, '"');
+    int align = 1;
     for (int32_t i = 0; i < len; ++i) {
         uint8_t c = str[i];
         switch (c) {
             case '"':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\\"", 2);
+                align += 2;
                 break;
             case '\n':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\n", 2);
+                align += 2;
                 break;
             case '\r':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\r", 2);
+                align += 2;
                 break;
             case '\0':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\0", 2);
+                align += 2;
                 break;
             case '\f':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\f", 2);
+                align += 2;
                 break;
             case '\v':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\v", 2);
+                align += 2;
                 break;
             case '\a':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\a", 2);
+                align += 2;
                 break;
             case '\b':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\b", 2);
+                align += 2;
                 break;
             case 27:
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\e", 2);
+                align += 2;
                 break;
             case '\\':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\\\", 2);
+                align += 2;
                 break;
             case '\t':
                 janet_buffer_push_bytes(buffer, (const uint8_t *)"\\t", 2);
+                align += 2;
                 break;
             default:
                 if (c < 32 || c > 126) {
@@ -180,13 +193,16 @@ static void janet_escape_string_impl(JanetBuffer *buffer, const uint8_t *str, in
                     buf[2] = janet_base64[(c >> 4) & 0xF];
                     buf[3] = janet_base64[c & 0xF];
                     janet_buffer_push_bytes(buffer, buf, 4);
+                    align += 4;
                 } else {
                     janet_buffer_push_u8(buffer, c);
+                    align++;
                 }
                 break;
         }
     }
     janet_buffer_push_u8(buffer, '"');
+    return align + 1;
 }
 
 static void janet_escape_string_b(JanetBuffer *buffer, const uint8_t *str) {
@@ -358,7 +374,7 @@ const uint8_t *janet_to_string(Janet x) {
 struct pretty {
     JanetBuffer *buffer;
     int depth;
-    int indent;
+    int align;
     int flags;
     int32_t bufstartlen;
     int32_t *keysort_buffer;
@@ -450,14 +466,15 @@ static int print_jdn_one(struct pretty *S, Janet x, int depth) {
     return 0;
 }
 
-static void print_newline(struct pretty *S, int just_a_space) {
+static void print_newline(struct pretty *S, int align) {
     int i;
-    if (just_a_space || (S->flags & JANET_PRETTY_ONELINE)) {
+    S->align = align;
+    if (S->flags & JANET_PRETTY_ONELINE) {
         janet_buffer_push_u8(S->buffer, ' ');
         return;
     }
     janet_buffer_push_u8(S->buffer, '\n');
-    for (i = 0; i < S->indent; i++) {
+    for (i = 0; i < S->align; i++) {
         janet_buffer_push_u8(S->buffer, ' ');
     }
 }
@@ -484,14 +501,12 @@ static const char *janet_pretty_colors[] = {
     "\x1B[36m"
 };
 
-#define JANET_PRETTY_DICT_ONELINE 4
-#define JANET_PRETTY_IND_ONELINE 10
 #define JANET_PRETTY_DICT_LIMIT 30
 #define JANET_PRETTY_DICT_KEYSORT_LIMIT 2000
 #define JANET_PRETTY_ARRAY_LIMIT 160
 
 /* Helper for pretty printing */
-static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
+static void janet_pretty_one(struct pretty *S, Janet x) {
     /* Add to seen */
     switch (janet_type(x)) {
         case JANET_NIL:
@@ -506,7 +521,7 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                     janet_buffer_push_cstring(S->buffer, janet_cycle_color);
                 }
                 janet_buffer_push_cstring(S->buffer, "<cycle ");
-                integer_to_string_b(S->buffer, janet_unwrap_integer(seenid));
+                S->align += 8 + integer_to_string_b(S->buffer, janet_unwrap_integer(seenid));
                 janet_buffer_push_u8(S->buffer, '>');
                 if (S->flags & JANET_PRETTY_COLOR) {
                     janet_buffer_push_cstring(S->buffer, "\x1B[0m");
@@ -528,9 +543,11 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
             if (janet_checktype(x, JANET_BUFFER) && janet_unwrap_buffer(x) == S->buffer) {
                 janet_buffer_ensure(S->buffer, S->buffer->count + S->bufstartlen * 4 + 3, 1);
                 janet_buffer_push_u8(S->buffer, '@');
-                janet_escape_string_impl(S->buffer, S->buffer->data, S->bufstartlen);
+                S->align += 1 + janet_escape_string_impl(S->buffer, S->buffer->data, S->bufstartlen);
             } else {
+                S->align -= S->buffer->count;
                 janet_description_b(S->buffer, x);
+                S->align += S->buffer->count;
             }
             if (color && (S->flags & JANET_PRETTY_COLOR)) {
                 janet_buffer_push_cstring(S->buffer, "\x1B[0m");
@@ -547,35 +564,34 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
             const char *startstr = isarray ? "@[" : hasbrackets ? "[" : "(";
             const char endchar = isarray ? ']' : hasbrackets ? ']' : ')';
             janet_buffer_push_cstring(S->buffer, startstr);
+            const int align = S->align += strlen(startstr);
             S->depth--;
-            S->indent += 2;
             if (S->depth == 0) {
                 janet_buffer_push_cstring(S->buffer, "...");
+                S->align += 3;
             } else {
-                if (!isarray && !(S->flags & JANET_PRETTY_ONELINE) && len >= JANET_PRETTY_IND_ONELINE)
-                    janet_buffer_push_u8(S->buffer, ' ');
-                if (is_dict_value && len >= JANET_PRETTY_IND_ONELINE) print_newline(S, 0);
                 if (len > JANET_PRETTY_ARRAY_LIMIT && !(S->flags & JANET_PRETTY_NOTRUNC)) {
                     for (i = 0; i < 3; i++) {
-                        if (i) print_newline(S, 0);
-                        janet_pretty_one(S, arr[i], 0);
+                        if (i) print_newline(S, align);
+                        janet_pretty_one(S, arr[i]);
                     }
-                    print_newline(S, 0);
+                    print_newline(S, align);
                     janet_buffer_push_cstring(S->buffer, "...");
-                    for (i = 0; i < 3; i++) {
-                        print_newline(S, 0);
-                        janet_pretty_one(S, arr[len - 3 + i], 0);
+                    S->align += 3;
+                    for (i = len - 3; i < len; i++) {
+                        print_newline(S, align);
+                        janet_pretty_one(S, arr[i]);
                     }
                 } else {
                     for (i = 0; i < len; i++) {
-                        if (i) print_newline(S, len < JANET_PRETTY_IND_ONELINE);
-                        janet_pretty_one(S, arr[i], 0);
+                        if (i) print_newline(S, align);
+                        janet_pretty_one(S, arr[i]);
                     }
                 }
             }
-            S->indent -= 2;
             S->depth++;
             janet_buffer_push_u8(S->buffer, endchar);
+            S->align++;
             break;
         }
         case JANET_STRUCT:
@@ -586,6 +602,7 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
             if (istable) {
                 JanetTable *t = janet_unwrap_table(x);
                 JanetTable *proto = t->proto;
+                S->align++;
                 janet_buffer_push_cstring(S->buffer, "@");
                 if (NULL != proto) {
                     Janet name = janet_table_get(proto, janet_ckeywordv("_name"));
@@ -596,6 +613,7 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                             janet_buffer_push_cstring(S->buffer, janet_class_color);
                         }
                         janet_buffer_push_bytes(S->buffer, n, len);
+                        S->align += len;
                         if (S->flags & JANET_PRETTY_COLOR) {
                             janet_buffer_push_cstring(S->buffer, "\x1B[0m");
                         }
@@ -613,25 +631,24 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                             janet_buffer_push_cstring(S->buffer, janet_class_color);
                         }
                         janet_buffer_push_bytes(S->buffer, n, len);
+                        S->align += len;
                         if (S->flags & JANET_PRETTY_COLOR) {
                             janet_buffer_push_cstring(S->buffer, "\x1B[0m");
                         }
                     }
                 }
             }
-            janet_buffer_push_cstring(S->buffer, "{");
+            janet_buffer_push_u8(S->buffer, '{');
+            const int align = ++S->align;
 
             S->depth--;
-            S->indent += 2;
             if (S->depth == 0) {
                 janet_buffer_push_cstring(S->buffer, "...");
+                S->align += 3;
             } else {
                 int32_t len = 0, cap = 0;
                 const JanetKV *kvs = NULL;
                 janet_dictionary_view(x, &kvs, &len, &cap);
-                if (!istable && !(S->flags & JANET_PRETTY_ONELINE) && len >= JANET_PRETTY_DICT_ONELINE)
-                    janet_buffer_push_u8(S->buffer, ' ');
-                if (is_dict_value && len >= JANET_PRETTY_DICT_ONELINE) print_newline(S, 0);
                 int32_t ks_start = S->keysort_start;
                 int truncated = 0;
 
@@ -644,15 +661,17 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                     int32_t j = 0;
                     for (int32_t i = 0; i < len; i++) {
                         while (janet_checktype(kvs[j].key, JANET_NIL)) j++;
-                        if (i) print_newline(S, len < JANET_PRETTY_DICT_ONELINE);
-                        janet_pretty_one(S, kvs[j].key, 0);
+                        if (i) print_newline(S, align);
+                        janet_pretty_one(S, kvs[j].key);
                         janet_buffer_push_u8(S->buffer, ' ');
-                        janet_pretty_one(S, kvs[j].value, 1);
+                        S->align++;
+                        janet_pretty_one(S, kvs[j].value);
                         j++;
                     }
                     if (truncated) {
-                        print_newline(S, 0);
+                        print_newline(S, align);
                         janet_buffer_push_cstring(S->buffer, "...");
+                        S->align += 3;
                     }
                 } else {
                     /* Sorted keys dictionaries */
@@ -685,24 +704,26 @@ static void janet_pretty_one(struct pretty *S, Janet x, int is_dict_value) {
                     }
 
                     for (int32_t i = 0; i < len; i++) {
-                        if (i) print_newline(S, len < JANET_PRETTY_DICT_ONELINE);
+                        if (i) print_newline(S, align);
                         int32_t j = S->keysort_buffer[i + ks_start];
-                        janet_pretty_one(S, kvs[j].key, 0);
+                        janet_pretty_one(S, kvs[j].key);
                         janet_buffer_push_u8(S->buffer, ' ');
-                        janet_pretty_one(S, kvs[j].value, 1);
+                        S->align++;
+                        janet_pretty_one(S, kvs[j].value);
                     }
 
                     if (truncated) {
-                        print_newline(S, 0);
+                        print_newline(S, align);
                         janet_buffer_push_cstring(S->buffer, "...");
+                        S->align += 3;
                     }
 
                 }
                 S->keysort_start = ks_start;
             }
-            S->indent -= 2;
             S->depth++;
             janet_buffer_push_u8(S->buffer, '}');
+            S->align++;
             break;
         }
     }
@@ -718,14 +739,14 @@ static JanetBuffer *janet_pretty_(JanetBuffer *buffer, int depth, int flags, Jan
     }
     S.buffer = buffer;
     S.depth = depth;
-    S.indent = 0;
+    S.align = 0;
     S.flags = flags;
     S.bufstartlen = startlen;
     S.keysort_capacity = 0;
     S.keysort_buffer = NULL;
     S.keysort_start = 0;
     janet_table_init(&S.seen, 10);
-    janet_pretty_one(&S, x, 0);
+    janet_pretty_one(&S, x);
     janet_table_deinit(&S.seen);
     return S.buffer;
 }
@@ -743,7 +764,7 @@ static JanetBuffer *janet_jdn_(JanetBuffer *buffer, int depth, Janet x, int32_t
     }
     S.buffer = buffer;
     S.depth = depth;
-    S.indent = 0;
+    S.align = 0;
     S.flags = 0;
     S.bufstartlen = startlen;
     S.keysort_capacity = 0;

src/core/specials.c

@@ -404,7 +404,7 @@ SlotHeadPair *dohead_destructure(JanetCompiler *c, SlotHeadPair *into, JanetFopt
 }
 
 /* Def or var a symbol in a local scope */
-static int namelocal(JanetCompiler *c, const uint8_t *head, int32_t flags, JanetSlot ret, int no_unused) {
+static int namelocal(JanetCompiler *c, const uint8_t *head, int32_t flags, JanetSlot ret, uint32_t def_flags) {
     int isUnnamedRegister = !(ret.flags & JANET_SLOT_NAMED) &&
                             ret.index > 0 &&
                             ret.envindex >= 0;
@@ -425,11 +425,10 @@ static int namelocal(JanetCompiler *c, const uint8_t *head, int32_t flags, Janet
         ret = localslot;
     }
     ret.flags |= flags;
-    if ((c->scope->flags & JANET_SCOPE_TOP) || no_unused) {
-        janetc_nameslot_no_unused(c, head, ret);
-    } else {
-        janetc_nameslot(c, head, ret);
+    if (c->scope->flags & JANET_SCOPE_TOP) {
+        def_flags |= JANET_DEFFLAG_NO_UNUSED;
     }
+    janetc_nameslot(c, head, ret, def_flags);
     return !isUnnamedRegister;
 }
 
@@ -443,7 +442,7 @@ static int varleaf(
         JanetSlot refslot;
         JanetTable *entry = janet_table_clone(reftab);
 
-        int is_redef = janet_truthy(janet_table_get_keyword(c->env, "redef"));
+        int is_redef = c->is_redef;
 
         JanetArray *ref;
         JanetBinding old_binding;
@@ -464,7 +463,11 @@ static int varleaf(
         return 1;
     } else {
         int no_unused = reftab && reftab->count && janet_truthy(janet_table_get_keyword(reftab, "unused"));
-        return namelocal(c, sym, JANET_SLOT_MUTABLE, s, no_unused);
+        int no_shadow = reftab && reftab->count && janet_truthy(janet_table_get_keyword(reftab, "shadow"));
+        uint32_t def_flags = 0;
+        if (no_unused) def_flags |= JANET_DEFFLAG_NO_UNUSED;
+        if (no_shadow) def_flags |= JANET_DEFFLAG_NO_SHADOWCHECK;
+        return namelocal(c, sym, JANET_SLOT_MUTABLE, s, def_flags);
     }
 }
 
@@ -505,12 +508,14 @@ static int defleaf(
     const uint8_t *sym,
     JanetSlot s,
     JanetTable *tab) {
+    JanetTable *entry = NULL;
+    int is_redef = 0;
     if (c->scope->flags & JANET_SCOPE_TOP) {
-        JanetTable *entry = janet_table_clone(tab);
+        entry = janet_table_clone(tab);
         janet_table_put(entry, janet_ckeywordv("source-map"),
                         janet_wrap_tuple(janetc_make_sourcemap(c)));
 
-        int is_redef = janet_truthy(janet_table_get_keyword(c->env, "redef"));
+        is_redef = c->is_redef;
         if (is_redef) janet_table_put(entry, janet_ckeywordv("redef"), janet_wrap_true());
 
         if (is_redef) {
@@ -530,12 +535,18 @@ static int defleaf(
             JanetSlot tabslot = janetc_cslot(janet_wrap_table(entry));
             janetc_emit_sss(c, JOP_PUT, tabslot, valsym, s, 0);
         }
-
-        /* Add env entry to env */
-        janet_table_put(c->env, janet_wrap_symbol(sym), janet_wrap_table(entry));
     }
     int no_unused = tab && tab->count && janet_truthy(janet_table_get_keyword(tab, "unused"));
-    return namelocal(c, sym, 0, s, no_unused);
+    int no_shadow = is_redef || (tab && tab->count && janet_truthy(janet_table_get_keyword(tab, "shadow")));
+    uint32_t def_flags = 0;
+    if (no_unused) def_flags |= JANET_DEFFLAG_NO_UNUSED;
+    if (no_shadow) def_flags |= JANET_DEFFLAG_NO_SHADOWCHECK;
+    int result = namelocal(c, sym, 0, s, def_flags);
+    if (entry) {
+        /* Add env entry to env AFTER namelocal to avoid the shadowcheck false positive */
+        janet_table_put(c->env, janet_wrap_symbol(sym), janet_wrap_table(entry));
+    }
+    return result;
 }
 
 static JanetSlot janetc_def(JanetFopts opts, int32_t argn, const Janet *argv) {
@@ -1066,10 +1077,10 @@ static JanetSlot janetc_fn(JanetFopts opts, int32_t argn, const Janet *argv) {
                     named_table = janet_table(10);
                     named_slot = janetc_farslot(c);
                 } else {
-                    janetc_nameslot(c, sym, janetc_farslot(c));
+                    janetc_nameslot(c, sym, janetc_farslot(c), 0);
                 }
             } else {
-                janetc_nameslot(c, sym, janetc_farslot(c));
+                janetc_nameslot(c, sym, janetc_farslot(c), 0);
             }
         } else {
             janet_v_push(destructed_params, janetc_farslot(c));
@@ -1118,7 +1129,9 @@ static JanetSlot janetc_fn(JanetFopts opts, int32_t argn, const Janet *argv) {
             JanetSlot slot = janetc_farslot(c);
             slot.flags = JANET_SLOT_NAMED | JANET_FUNCTION;
             janetc_emit_s(c, JOP_LOAD_SELF, slot, 1);
-            janetc_nameslot_no_unused(c, sym, slot);
+            /* We should figure out a better way to avoid `(def x 1) (def x :shadow (fn x [...] ...))` triggering a
+             * shadow lint for the last x */
+            janetc_nameslot(c, sym, slot, JANET_DEFFLAG_NO_UNUSED | JANET_DEFFLAG_NO_SHADOWCHECK);
         }
     }
 

src/mainclient/shell.c

@@ -26,6 +26,7 @@
 
 #include <janet.h>
 #include <errno.h>
+#include <assert.h>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -362,33 +363,50 @@ static void clear(void) {
     }
 }
 
+static int getplen(void) {
+    int _plen = gbl_plen;
+    /* Ensure at least 16 characters of data entry; */
+    while (_plen && (_plen + 16 > gbl_cols)) {
+        _plen--;
+    }
+    return _plen;
+}
+
 static void refresh(void) {
     char seq[64];
     JanetBuffer b;
 
+    /* If prompt is too long, truncate */
+    int _plen = getplen();
+
     /* Keep cursor position on screen */
     char *_buf = gbl_buf;
     int _len = gbl_len;
     int _pos = gbl_pos;
-    while ((gbl_plen + _pos) >= gbl_cols) {
+
+    while ((_plen + _pos) >= gbl_cols) {
         _buf++;
         _len--;
         _pos--;
     }
-    while ((gbl_plen + _len) > gbl_cols) {
+
+    while ((_plen + _len) > gbl_cols) {
         _len--;
     }
 
+
     janet_buffer_init(&b, 0);
     /* Cursor to left edge, gbl_prompt and buffer */
     janet_buffer_push_u8(&b, '\r');
-    janet_buffer_push_cstring(&b, gbl_prompt);
-    janet_buffer_push_bytes(&b, (uint8_t *) _buf, _len);
+    janet_buffer_push_bytes(&b, (const uint8_t *) gbl_prompt, _plen);
+    if (_len > 0) {
+        janet_buffer_push_bytes(&b, (uint8_t *) _buf, _len);
+    }
     /* Erase to right */
     janet_buffer_push_cstring(&b, "\x1b[0K\r");
     /* Move cursor to original position. */
-    if (_pos + gbl_plen) {
-        snprintf(seq, 64, "\x1b[%dC", (int)(_pos + gbl_plen));
+    if (_pos + _plen) {
+        snprintf(seq, 64, "\x1b[%dC", (int)(_pos + _plen));
         janet_buffer_push_cstring(&b, seq);
     }
     if (write_console((char *) b.data, b.count) == -1) {
@@ -414,7 +432,8 @@ static int insert(char c, int draw) {
             gbl_buf[gbl_pos++] = c;
             gbl_buf[++gbl_len] = '\0';
             if (draw) {
-                if (gbl_plen + gbl_len < gbl_cols) {
+                int _plen = getplen();
+                if (_plen + gbl_len < gbl_cols) {
                     /* Avoid a full update of the line in the
                      * trivial case. */
                     if (write_console(&c, 1) == -1) return -1;
@@ -925,11 +944,12 @@ static int line() {
     gbl_len = 0;
     gbl_pos = 0;
     while (gbl_prompt[gbl_plen]) gbl_plen++;
+    int _plen = getplen();
     gbl_buf[0] = '\0';
 
     addhistory();
 
-    if (write_console((char *) gbl_prompt, gbl_plen) == -1) return -1;
+    if (write_console((char *) gbl_prompt, _plen) == -1) return -1;
     for (;;) {
         char c;
         char seq[5];

test/helper.janet

@@ -27,9 +27,11 @@
   (def line-info (string/format "%s:%d"
                               (frame :source) (frame :source-line)))
   (if x
-    (when is-verbose (eprintf "\e[32m✔\e[0m %s: %s: %v" line-info (describe e) x))
+    (when is-verbose
+      (eprintf "\e[32m✔\e[0m %s: %s: %v" line-info (describe e) x)
+      (eflush) (flush))
     (do
-      (eprintf "\e[31m✘\e[0m %s: %s: %v" line-info (describe e) x) (eflush)))
+      (eprintf "\e[31m✘\e[0m %s: %s: %v" line-info (describe e) x) (eflush) (flush)))
   x)
 
 (defn skip-asserts
@@ -38,7 +40,7 @@
   (+= skip-n n)
   nil)
 
-(defmacro assert
+(defmacro assert :shadow
   [x &opt e]
   (def xx (gensym))
   (default e (string/format "%j" x))
@@ -50,12 +52,12 @@
 (defmacro assert-error
   [msg & forms]
   (def errsym (keyword (gensym)))
-  ~(assert (= ,errsym (try (do ,;forms) ([_] ,errsym))) ,msg))
+  ~(as-macro ,assert (= ,errsym (try (do ,;forms) ([_] ,errsym))) ,msg))
 
 (defmacro assert-error-value
   [msg errval & forms]
   (def e (gensym))
-  ~(assert (= ,errval (try (do ,;forms) ([,e] ,e))) ,msg))
+  ~(as-macro ,assert (= ,errval (try (do ,;forms) ([,e] ,e))) ,msg))
 
 (defn check-compile-error
   [form]

test/suite-array.janet

@@ -70,9 +70,9 @@
 (assert (= (array/pop @[]) nil) "array/pop empty")
 
 # Code coverage
-(def a @[1])
-(array/pop a)
-(array/trim a)
+(def a1 @[1])
+(array/pop a1)
+(array/trim a1)
 (array/ensure @[1 1] 6 2)
 
 # array/join

test/suite-buffer.janet

@@ -48,8 +48,8 @@
 
 (assert (deep= (buffer/push @"AA" @"BB") @"AABB") "buffer/push buffer")
 (assert (deep= (buffer/push @"AA" 66 66) @"AABB") "buffer/push int")
-(def b @"AA")
-(assert (deep= (buffer/push b b) @"AAAA") "buffer/push buffer self")
+(def b1 @"AA")
+(assert (deep= (buffer/push b1 b1) @"AAAA") "buffer/push buffer self")
 
 # buffer/push-byte
 (assert (deep= (buffer/push-byte @"AA" 66) @"AAB") "buffer/push-byte")
@@ -145,8 +145,8 @@
 
 # Regression #301
 # a3d4ecddb
-(def b (buffer/new-filled 128 0x78))
-(assert (= 38 (length (buffer/blit @"" b -1 90))) "buffer/blit 1")
+(def b8 (buffer/new-filled 128 0x78))
+(assert (= 38 (length (buffer/blit @"" b8 -1 90))) "buffer/blit 1")
 
 (def a @"abcdefghijklm")
 (assert (deep= @"abcde" (buffer/blit @"" a -1 0 5)) "buffer/blit 2")

test/suite-compile.janet

@@ -84,23 +84,23 @@
 (assert (get result :error) "bad sum3 fuzz issue valgrind")
 
 # Issue #1700
-(def result
+(def result1
   (compile
     '(defn fuzz-case-1
       [start end &]
       (if end
         (if e start (lazy-range (+ 1 start) end)))
       1)))
-(assert (get result :error) "fuzz case issue #1700")
+(assert (get result1 :error) "fuzz case issue #1700")
 
 # Issue #1702 - fuzz case with upvalues
-(def result
+(def result2
   (compile
   '(each item [1 2 3]
     # Generate a lot of upvalues (more than 224)
     (def ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;out-buf @"")
     (with-dyns [:out out-buf] 1))))
-(assert result "bad upvalues fuzz case")
+(assert result2 "bad upvalues fuzz case")
 
 # Named argument linting
 # Enhancement for #1654
@@ -117,14 +117,14 @@
 (defn check-good-compile
   [code msg]
   (def lints @[])
-  (def result (compile code (curenv) "suite-compile.janet" lints))
-  (assert (and (function? result) (empty? lints)) msg))
+  (def result4 (compile code (curenv) "suite-compile.janet" lints))
+  (assert (and (function? result4) (empty? lints)) msg))
 
 (defn check-lint-compile
   [code msg]
   (def lints @[])
-  (def result (compile code (curenv) "suite-compile.janet" lints))
-  (assert (and (function? result) (next lints)) msg))
+  (def result4 (compile code (curenv) "suite-compile.janet" lints))
+  (assert (and (function? result4) (next lints)) msg))
 
 (check-good-compile '(fnamed) "named no args")
 (check-good-compile '(fnamed :x 1 :y 2 :z 3) "named full args")
@@ -150,5 +150,10 @@
 (check-lint-compile '(g 1 2 :z) "g lint 1")
 (check-lint-compile '(g 1 2 :z 4 5) "g lint 2")
 
-(end-suite)
+# Variable shadowing linting
+(def outer1 "a")
+(check-lint-compile '(def outer1 "b") "shadow global-to-global")
+(check-lint-compile '(let [outer1 "b"] outer1) "shadow local-to-global")
+(check-lint-compile '(do (def x "b") (def x "c")) "shadow local-to-local")
 
+(end-suite)

test/suite-ev2.janet

@@ -43,9 +43,9 @@
 (assert (deep= '(:error "deadline expired" nil) (ev/take super)) "deadline expirataion")
 
 # Another variant
-(def thread-channel (ev/thread-chan 100))
-(def super (ev/thread-chan 10))
-(defn worker []
+(def thread-channel :shadow (ev/thread-chan 100))
+(def super :shadow (ev/thread-chan 10))
+(defn worker :shadow []
   (while true
     (def item (ev/take thread-channel))
     (when (= item :deadline)

test/suite-io.janet

@@ -37,7 +37,7 @@
 
 # Printing to functions
 # 4e263b8c3
-(def out-buf @"")
+(def out-buf :shadow @"")
 (defn prepend [x]
   (with-dyns [:out out-buf]
     (prin "> " x)))
@@ -59,8 +59,8 @@
 
 # issue #1055 - 2c927ea76
 (let [b @""]
-  (defn dummy [a b c]
-    (+ a b c))
+  (defn dummy [a bb c]
+    (+ a bb c))
   (trace dummy)
   (defn errout [arg]
     (buffer/push b arg))

test/suite-marsh.janet

@@ -95,11 +95,11 @@
 (do
   (defn f1
     [a]
-    (defn f1 [] (++ (a 0)))
+    (defn f1 :shadow [] (++ (a 0)))
     (defn f2 [] (++ (a 0)))
     (error [f1 f2]))
   (def [_ tup] (protect (f1 @[0])))
-  (def [f1 f2] (unmarshal (marshal tup make-image-dict) load-image-dict))
+  (def [f1 f2] :shadow (unmarshal (marshal tup make-image-dict) load-image-dict))
   (assert (= 1 (f1)) "marshal-non-resumable-closure 1")
   (assert (= 2 (f2)) "marshal-non-resumable-closure 2"))
 
@@ -108,10 +108,10 @@
 (do
   (defn f1
     [a]
-    (defn f1 [] (++ (a 0)))
-    (defn f2 [] (++ (a 0)))
+    (defn f1 :shadow [] (++ (a 0)))
+    (defn f2 :shadow [] (++ (a 0)))
     (marshal [f1 f2] make-image-dict))
-  (def [f1 f2] (unmarshal (f1 @[0]) load-image-dict))
+  (def [f1 f2] :shadow (unmarshal (f1 @[0]) load-image-dict))
   (assert (= 1 (f1)) "marshal-live-closure 1")
   (assert (= 2 (f2)) "marshal-live-closure 2"))
 
@@ -189,11 +189,11 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
 (assert (deep= t tclone) "table/weak marsh 7")
 
 # table weak keys
-(def t (table/weak-keys 1))
+(def t :shadow (table/weak-keys 1))
 (put t @"" keep-value)
 (put t :key @"")
 (assert (= 2 (length t)) "table/weak-keys marsh 1")
-(def tclone (-> t marshal unmarshal))
+(def tclone :shadow (-> t marshal unmarshal))
 (assert (= 2 (length tclone)) "table/weak-keys marsh 2")
 (gccollect)
 (assert (= 1 (length tclone)) "table/weak-keys marsh 3")
@@ -201,23 +201,23 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
 (assert (deep= t tclone) "table/weak-keys marsh 5")
 
 # table weak values
-(def t (table/weak-values 1))
+(def t :shadow (table/weak-values 1))
 (put t @"" keep-value)
 (put t :key @"")
 (assert (= 2 (length t)) "table/weak-values marsh 1")
-(def tclone (-> t marshal unmarshal))
+(def tclone :shadow (-> t marshal unmarshal))
 (assert (= 2 (length tclone)) "table/weak-values marsh 2")
 (gccollect)
 (assert (= 1 (length t)) "table/weak-value marsh 3")
 (assert (deep= (freeze t) (freeze tclone)) "table/weak-values marsh 4")
 
 # tables with prototypes
-(def t (table/weak-values 1))
+(def t :shadow (table/weak-values 1))
 (table/setproto t @{:abc 123})
 (put t @"" keep-value)
 (put t :key @"")
 (assert (= 2 (length t)) "marsh weak tables with prototypes 1")
-(def tclone (-> t marshal unmarshal))
+(def tclone :shadow (-> t marshal unmarshal))
 (assert (= 2 (length tclone)) "marsh weak tables with prototypes 2")
 (gccollect)
 (assert (= 1 (length t)) "marsh weak tables with prototypes 3")

test/suite-parse.janet

@@ -138,13 +138,13 @@
 
 # Parser clone
 # 43520ac67
-(def p (parser/new))
-(assert (= 7 (parser/consume p "(1 2 3 ")) "parser 1")
-(def p2 (parser/clone p))
+(def p0 (parser/new))
+(assert (= 7 (parser/consume p0 "(1 2 3 ")) "parser 1")
+(def p2 (parser/clone p0))
 (parser/consume p2 ") 1 ")
-(parser/consume p ") 1 ")
-(assert (deep= (parser/status p) (parser/status p2)) "parser 2")
-(assert (deep= (parser/state p) (parser/state p2)) "parser 3")
+(parser/consume p0 ") 1 ")
+(assert (deep= (parser/status p0) (parser/status p2)) "parser 2")
+(assert (deep= (parser/state p0) (parser/state p2)) "parser 3")
 
 # Parser errors
 # 976dfc719
@@ -179,11 +179,11 @@
 (parser/consume p1 step1)
 (loop [_ :iterate (parser/produce p1)])
 (parser/state p1)
-(def p2 (parser/clone p1))
-(parser/state p2)
-(parser/consume p2 step2)
-(loop [_ :iterate (parser/produce p2)])
-(parser/state p2)
+(def p3 (parser/clone p1))
+(parser/state p3)
+(parser/consume p3 step2)
+(loop [_ :iterate (parser/produce p3)])
+(parser/state p3)
 
 # parser delimiter errors
 (defn test-error [delim fmt]
@@ -202,11 +202,11 @@
 (parser/consume p ")")
 (assert (= (parser/produce p) ["hello"]))
 
-(def p (parser/new))
-(parser/consume p `("hel`)
-(parser/insert p `lo`)
-(parser/consume p `")`)
-(assert (= (parser/produce p) ["hello"]))
+(def p4 (parser/new))
+(parser/consume p4 `("hel`)
+(parser/insert p4 `lo`)
+(parser/consume p4 `")`)
+(assert (= (parser/produce p4) ["hello"]))
 
 # Hex floats
 (assert (= math/pi +0x1.921fb54442d18p+0001))

test/suite-peg.janet

@@ -84,10 +84,10 @@
 
 # Substitution test with peg
 # d7626f8c5
-(def grammar '(accumulate (any (+ (/ "dog" "purple panda") (<- 1)))))
+(def grammar1 '(accumulate (any (+ (/ "dog" "purple panda") (<- 1)))))
 (defn try-grammar [text]
   (assert (= (string/replace-all "dog" "purple panda" text)
-             (0 (peg/match grammar text))) text))
+             (0 (peg/match grammar1 text))) text))
 
 (try-grammar "i have a dog called doug the dog. he is good.")
 (try-grammar "i have a dog called doug the dog. he is a good boy.")
@@ -336,7 +336,7 @@
 
 # unref
 # 96513665d
-(def grammar
+(def grammar2
   (peg/compile
     ~{:main (* :tagged -1)
       :tagged (unref (replace (* :open-tag :value :close-tag) ,struct))
@@ -344,9 +344,9 @@
       :value (* (constant :value) (group (any (+ :tagged :untagged))))
       :close-tag (* "</" (backmatch :tag-name) ">")
       :untagged (capture (any (if-not "<" 1)))}))
-(check-deep grammar "<p><em>foobar</em></p>"
+(check-deep grammar2 "<p><em>foobar</em></p>"
             @[{:tag "p" :value @[{:tag "em" :value @["foobar"]}]}])
-(check-deep grammar "<p>foobar</p>" @[{:tag "p" :value @["foobar"]}])
+(check-deep grammar2 "<p>foobar</p>" @[{:tag "p" :value @["foobar"]}])
 
 # Using a large test grammar
 # cf05ff610
@@ -369,7 +369,7 @@
   (def sym (symbol text))
   [(if (or (root-env sym) (specials sym)) :coresym :symbol) text])
 
-(def grammar
+(def grammar3
   ~{:ws (set " \v\t\r\f\n\0")
     :readermac (set "';~,")
     :symchars (+ (range "09" "AZ" "az" "\x80\xFF")
@@ -408,13 +408,13 @@
     :dict (* '"@" :struct)
     :main (+ :root (error ""))})
 
-(def p (peg/compile grammar))
+(def porig (peg/compile grammar3))
 
 # Just make sure is valgrind clean.
-(def p (-> p make-image load-image))
+(def pprime (-> porig make-image load-image))
 
-(assert (peg/match p "abc") "complex peg grammar 1")
-(assert (peg/match p "[1 2 3 4]") "complex peg grammar 2")
+(assert (peg/match pprime "abc") "complex peg grammar 1")
+(assert (peg/match pprime "[1 2 3 4]") "complex peg grammar 2")
 
 ###
 ### Compiling brainfuck to Janet.
@@ -565,8 +565,8 @@
         "peg/replace-all function")
 
 # 9dc7e8ed3
-(defn peg-test [name f peg subst text expected]
-  (assert (= (string (f peg subst text)) expected) name))
+(defn peg-test [name f pegg subst text expected]
+  (assert (= (string (f pegg subst text)) expected) name))
 
 (peg-test "peg/replace has access to captures"
           peg/replace
@@ -602,10 +602,10 @@
 
 # Marshal and unmarshal pegs
 # 446ab037b
-(def p (-> "abcd" peg/compile marshal unmarshal))
-(assert (peg/match p "abcd") "peg marshal 1")
-(assert (peg/match p "abcdefg") "peg marshal 2")
-(assert (not (peg/match p "zabcdefg")) "peg marshal 3")
+(def p3 (-> "abcd" peg/compile marshal unmarshal))
+(assert (peg/match p3 "abcd") "peg marshal 1")
+(assert (peg/match p3 "abcdefg") "peg marshal 2")
+(assert (not (peg/match p3 "zabcdefg")) "peg marshal 3")
 
 # to/thru bug
 # issue #971 - a895219d2
@@ -669,10 +669,10 @@
           (peg/match '(if (not (* (constant 7) "a")) "hello") "hello")
           @[]) "peg if not")
 
-(defn test [name peg input expected]
-  (assert-no-error "compile peg" (peg/compile peg))
-  (assert-no-error "marshal/unmarshal peg" (-> peg marshal unmarshal))
-  (assert (deep= (peg/match peg input) expected) name))
+(defn test [name pegg input expected]
+  (assert-no-error "compile peg" (peg/compile pegg))
+  (assert-no-error "marshal/unmarshal peg" (-> pegg marshal unmarshal))
+  (assert (deep= (peg/match pegg input) expected) name))
 
 (test "sub: matches the same input twice"
       ~(sub "abcd" "abc")
@@ -852,20 +852,20 @@
       @[["b" "b" "b"]])
 
 # Debug and ?? tests.
-(defn test-stderr [name peg input expected-matches expected-stderr]
+(defn test-stderr [name pegg input expected-matches expected-stderr]
   (with-dyns [:err @""]
-    (test name peg input expected-matches))
+    (test name pegg input expected-matches))
   (def actual @"")
   (with-dyns [:err actual *err-color* true]
-    (peg/match peg input))
+    (peg/match pegg input))
   (assert (deep= (string actual) expected-stderr)))
 
-(defn test-stderr-no-color [name peg input expected-matches expected-stderr]
+(defn test-stderr-no-color [name pegg input expected-matches expected-stderr]
   (with-dyns [:err @""]
-    (test name peg input expected-matches))
+    (test name pegg input expected-matches))
   (def actual @"")
   (with-dyns [:err actual *err-color* false]
-    (peg/match peg input))
+    (peg/match pegg input))
   (assert (deep= (string actual) expected-stderr)))
 
 (test-stderr

test/suite-pp.janet

@@ -44,8 +44,8 @@
 (def buftemp @"abcd")
 (assert (= (string (buffer/format buftemp "---%p---" buftemp))
            `abcd---@"abcd"---`) "buffer/format on self 1")
-(def buftemp @"abcd")
-(assert (= (string (buffer/format buftemp "---%p %p---" buftemp buftemp))
+(def buftemp2 @"abcd")
+(assert (= (string (buffer/format buftemp2 "---%p %p---" buftemp2 buftemp2))
            `abcd---@"abcd" @"abcd"---`) "buffer/format on self 2")
 
 # 5c364e0
@@ -61,5 +61,68 @@
 (check-jdn "a string")
 (check-jdn @"a buffer")
 
+# Test multiline pretty specifiers
+(let [tup [:keyword "string" @"buffer"]
+      tab @{true (table/setproto @{:bar tup
+                                   :baz 42}
+                                 @{:_name "Foo"})}]
+  (set (tab tup) tab)
+  (assert (= (string/format "%m" {tup @[tup tab]
+                                  'symbol tup})
+          `
+{symbol (:keyword
+         "string"
+         @"buffer")
+ (:keyword
+  "string"
+  @"buffer") @[(:keyword
+                "string"
+                @"buffer")
+               @{true @Foo{:bar (:keyword
+                                 "string"
+                                 @"buffer")
+                           :baz 42}
+                 (:keyword
+                  "string"
+                  @"buffer") <cycle 2>}]}`))
+  (assert (= (string/format "%p" {(freeze (zipcoll (range 42)
+                                                   (range -42 0))) tab})
+             `
+{{0 -42
+  1 -41
+  2 -40
+  3 -39
+  4 -38
+  5 -37
+  6 -36
+  7 -35
+  8 -34
+  9 -33
+  10 -32
+  11 -31
+  12 -30
+  13 -29
+  14 -28
+  15 -27
+  16 -26
+  17 -25
+  18 -24
+  19 -23
+  20 -22
+  21 -21
+  22 -20
+  23 -19
+  24 -18
+  25 -17
+  26 -16
+  27 -15
+  28 -14
+  29 -13
+  ...} @{true @Foo{:bar (:keyword
+                         "string"
+                         @"buffer")
+                   :baz 42}
+         (:keyword
+          "string"
+          @"buffer") <cycle 1>}}`)))
 (end-suite)
-

test/suite-vm.janet

@@ -132,11 +132,11 @@
 
 # Cancel test
 # 28439d822
-(def f (fiber/new (fn [&] (yield 1) (yield 2) (yield 3) 4) :yti))
-(assert (= 1 (resume f)) "cancel resume 1")
-(assert (= 2 (resume f)) "cancel resume 2")
-(assert (= :hi (cancel f :hi)) "cancel resume 3")
-(assert (= :error (fiber/status f)) "cancel resume 4")
+(def fc (fiber/new (fn [&] (yield 1) (yield 2) (yield 3) 4) :yti))
+(assert (= 1 (resume fc)) "cancel resume 1")
+(assert (= 2 (resume fc)) "cancel resume 2")
+(assert (= :hi (cancel fc :hi)) "cancel resume 3")
+(assert (= :error (fiber/status fc)) "cancel resume 4")
 
 (end-suite)