diff --git a/src/core/asm.c b/src/core/asm.c
index 1a732666..37ccb379 100644
--- a/src/core/asm.c
+++ b/src/core/asm.c
@@ -24,21 +24,6 @@
 #include <dst/dst.h>
 #include "util.h"
 
-/* Convert a slot to to an integer for bytecode */
-
-/* Types of instructions (some of them) */
-/* _0arg - op.---.--.-- (return-nil, noop, vararg arguments)
- * _s - op.src.--.-- (push1)
- * _l - op.XX.XX.XX (jump)
- * _ss - op.dest.XX.XX (move, swap)
- * _sl - op.check.XX.XX (jump-if)
- * _st - op.check.TT.TT (typecheck)
- * _si - op.dest.XX.XX (load-integer)
- * _sss - op.dest.op1.op2 (add, subtract, arithmetic, comparison)
- * _ses - op.dest.up.which (load-upvalue, save-upvalue)
- * _sc - op.dest.CC.CC (load-constant, closure)
- */
-
 /* Definition for an instruction in the assembler */
 typedef struct DstInstructionDef DstInstructionDef;
 struct DstInstructionDef {
@@ -919,7 +904,7 @@ static int cfun_asm(DstArgs args) {
     }
 }
 
-int cfun_disasm(DstArgs args) {
+static int cfun_disasm(DstArgs args) {
     DstFunction *f;
     DST_FIXARITY(args, 1);
     DST_ARG_FUNCTION(f, args, 0);
diff --git a/src/core/compile.h b/src/core/compile.h
index 6cbff2af..349ce922 100644
--- a/src/core/compile.h
+++ b/src/core/compile.h
@@ -67,10 +67,10 @@ typedef struct DstSpecial DstSpecial;
 
 /* A stack slot */
 struct DstSlot {
+    Dst constant; /* If the slot has a constant value */
     int32_t index;
     int32_t envindex; /* 0 is local, positive number is an upvalue */
     uint32_t flags;
-    Dst constant; /* If the slot has a constant value */
 };
 
 #define DST_SCOPE_FUNCTION 1
@@ -80,9 +80,9 @@ struct DstSlot {
 
 /* A symbol and slot pair */
 typedef struct SymPair {
+    DstSlot slot;
     const uint8_t *sym;
     int keep;
-    DstSlot slot;
 } SymPair;
 
 /* A lexical scope during compilation */
@@ -101,12 +101,12 @@ struct DstScope {
     /* Map of symbols to slots. Use a simple linear scan for symbols. */
     SymPair *syms;
 
-    /* Regsiter allocator */
-    DstcRegisterAllocator ra;
-
     /* FuncDefs */
     DstFuncDef **defs;
 
+    /* Regsiter allocator */
+    DstcRegisterAllocator ra;
+
     /* Referenced closure environents. The values at each index correspond
      * to which index to get the environment from in the parent. The environment
      * that corresponds to the direct parent's stack will always have value 0. */
@@ -121,7 +121,6 @@ struct DstScope {
 
 /* Compilation state */
 struct DstCompiler {
-    int recursion_guard;
     
     /* Pointer to current scope */
     DstScope *scope;
@@ -129,16 +128,20 @@ struct DstCompiler {
     uint32_t *buffer;
     DstSourceMapping *mapbuffer;
 
-    /* Keep track of where we are in the source */
-    DstSourceMapping current_mapping;
-
     /* Hold the environment */
     DstTable *env;
 
     /* Name of source to attach to generated functions */
     const uint8_t *source;
 
+    /* The result of compilation */
     DstCompileResult result;
+
+    /* Keep track of where we are in the source */
+    DstSourceMapping current_mapping;
+
+    /* Prevent unbounded recursion */
+    int recursion_guard;
 };
 
 #define DST_FOPTS_TAIL 0x10000
@@ -148,8 +151,8 @@ struct DstCompiler {
 /* Options for compiling a single form */
 struct DstFopts {
     DstCompiler *compiler;
-    uint32_t flags; /* bit set of accepted primitive types */
     DstSlot hint;
+    uint32_t flags; /* bit set of accepted primitive types */
 };
 
 /* Get the default form options */
diff --git a/src/core/corelib.c b/src/core/corelib.c
index a9805c53..e3efbefd 100644
--- a/src/core/corelib.c
+++ b/src/core/corelib.c
@@ -256,10 +256,11 @@ static int dst_core_gcinterval(DstArgs args) {
 
 static int dst_core_type(DstArgs args) {
     DST_FIXARITY(args, 1);
-    if (dst_checktype(args.v[0], DST_ABSTRACT)) {
+    DstType t = dst_type(args.v[0]);
+    if (t == DST_ABSTRACT) {
         DST_RETURN(args, dst_csymbolv(dst_abstract_type(dst_unwrap_abstract(args.v[0]))->name));
     } else {
-        DST_RETURN(args, dst_csymbolv(dst_type_names[dst_type(args.v[0])]));
+        DST_RETURN(args, dst_csymbolv(dst_type_names[t]));
     }
 }
 
@@ -282,9 +283,8 @@ static int dst_core_next(DstArgs args) {
             : dst_struct_find(st, args.v[1]);
         kv = dst_struct_next(st, kv);
     }
-    if (kv) {
+    if (kv)
         DST_RETURN(args, kv->key);
-    }
     DST_RETURN_NIL(args);
 }
 
@@ -418,7 +418,7 @@ static void templatize_varop(
             sizeof(varop_asm));
 }
 
-DstTable *dst_stl_env(int flags) {
+DstTable *dst_core_env(void) {
     static uint32_t error_asm[] = {
         DOP_ERROR
     };
@@ -510,8 +510,5 @@ DstTable *dst_stl_env(int flags) {
     /* Run bootstrap source */
     dst_dobytes(env, dst_gen_core, sizeof(dst_gen_core), "core.dst");
 
-    if (flags & DST_STL_NOGCROOT)
-        dst_gcunroot(dst_wrap_table(env));
-
     return env;
 }
diff --git a/src/core/os.c b/src/core/os.c
index 9cb5ac3a..4cc3aa16 100644
--- a/src/core/os.c
+++ b/src/core/os.c
@@ -195,14 +195,14 @@ static int os_exit(DstArgs args) {
     return 0;
 }
 
-/* Shim for windows */
+/* Clock shim for windows */
 #ifdef DST_WINDOWS
 struct timespec {
     long tv_sec;
     long tv_nsec;
 };
 static int clock_gettime(int, struct timespec *spec) {
-    int64 wintime;
+    int64_t wintime;
     GetSystemTimeAsFileTime((FILETIME*)&wintime);
     wintime -= 116444736000000000LL;  /* Windows epic is 1601, jan 1 */
     spec->tv_sec  = wintime / 10000000LL;
@@ -210,6 +210,7 @@ static int clock_gettime(int, struct timespec *spec) {
     spec->tv_nsec = wintime % 10000000LL * 100;
     return 0;
 }
+#define CLOCK_REALTIME 0
 #endif
 
 static int os_clock(DstArgs args) {
diff --git a/src/core/symcache.c b/src/core/symcache.c
index b08b3685..b1b95f52 100644
--- a/src/core/symcache.c
+++ b/src/core/symcache.c
@@ -209,8 +209,10 @@ static void inc_gensym(void) {
     for (int i = sizeof(gensym_counter) - 2; i; i--) {
         if (gensym_counter[i] == '9') {
             gensym_counter[i] = 'a';
+            break;
         } else if (gensym_counter[i] == 'z') {
             gensym_counter[i] = 'A';
+            break;
         } else if (gensym_counter[i] == 'Z') {
             gensym_counter[i] = '0';
         } else {
diff --git a/src/core/vm.c b/src/core/vm.c
index fbac0e2d..be683edf 100644
--- a/src/core/vm.c
+++ b/src/core/vm.c
@@ -1262,7 +1262,7 @@ DstSignal dst_call(
 }
 
 /* Setup VM */
-int dst_init() {
+int dst_init(void) {
     /* Garbage collection */
     dst_vm_blocks = NULL;
     dst_vm_next_collection = 0;
@@ -1283,7 +1283,7 @@ int dst_init() {
 }
 
 /* Clear all memory associated with the VM */
-void dst_deinit() {
+void dst_deinit(void) {
     dst_clear_memory();
     dst_symcache_deinit();
     free(dst_vm_roots);
diff --git a/src/include/dst/dst.h b/src/include/dst/dst.h
index aeefaf34..1f615914 100644
--- a/src/include/dst/dst.h
+++ b/src/include/dst/dst.h
@@ -515,9 +515,9 @@ Dst dst_wrap_abstract(void *x);
 
 /* Hold components of arguments passed to DstCFunction. */
 struct DstArgs {
-    int32_t n;
     Dst *v;
     Dst *ret;
+    int32_t n;
 };
 
 /* Fiber flags */
@@ -855,16 +855,16 @@ enum DstCompileStatus {
     DST_COMPILE_ERROR
 };
 struct DstCompileResult {
-    enum DstCompileStatus status;
     DstFuncDef *funcdef;
     const uint8_t *error;
     DstFiber *macrofiber;
     DstSourceMapping error_mapping;
+    enum DstCompileStatus status;
 };
 DstCompileResult dst_compile(Dst source, DstTable *env, const uint8_t *where);
 
 /* Get the default environment for dst */
-DstTable *dst_stl_env();
+DstTable *dst_core_env(void);
 
 int dst_dobytes(DstTable *env, const uint8_t *bytes, int32_t len, const char *sourcePath);
 int dst_dostring(DstTable *env, const char *str, const char *sourcePath);
@@ -939,7 +939,7 @@ void dst_puts(const uint8_t *str);
 const uint8_t *dst_symbol(const uint8_t *str, int32_t len);
 const uint8_t *dst_symbol_from_string(const uint8_t *str);
 const uint8_t *dst_csymbol(const char *str);
-const uint8_t *dst_symbol_gen();
+const uint8_t *dst_symbol_gen(void);
 #define dst_symbolv(str, len) dst_wrap_symbol(dst_symbol((str), (len)))
 #define dst_csymbolv(cstr) dst_wrap_symbol(dst_csymbol(cstr))
 
@@ -1033,10 +1033,6 @@ void dst_env_cfuns(DstTable *env, const DstReg *cfuns);
 DstBindingType dst_env_resolve(DstTable *env, const uint8_t *sym, Dst *out);
 DstTable *dst_env_arg(DstArgs args);
 
-/* STL */
-#define DST_STL_NOGCROOT 1
-DstTable *dst_stl_env(int flags);
-
 /* C Function helpers */
 int dst_arity_err(DstArgs args, int32_t n, const char *prefix);
 int dst_type_err(DstArgs args, int32_t n, DstType expected);
diff --git a/src/mainclient/main.c b/src/mainclient/main.c
index 1d5c957a..4fefc1d1 100644
--- a/src/mainclient/main.c
+++ b/src/mainclient/main.c
@@ -32,7 +32,7 @@ int main(int argc, char **argv) {
 
     /* Set up VM */
     dst_init();
-    env = dst_stl_env(0);
+    env = dst_core_env();
 
     /* Create args tuple */
     args = dst_array(argc);