Support adding arbitrary metadata to bindings

src/core/specials.c

@@ -251,6 +251,9 @@ static JanetTable *handleattr(JanetCompiler *c, int32_t argn, const Janet *argv)
             case JANET_STRING:
                 janet_table_put(tab, janet_ckeywordv("doc"), attr);
                 break;
+            case JANET_STRUCT:
+                janet_table_merge_struct(tab, janet_unwrap_struct(attr));
+                break;
         }
     }
     return tab;

test/suite0004.janet

@@ -70,5 +70,17 @@
 (assert (= ~(,defn 1 2 3) [defn 1 2 3]) "bracket tuples are never macros")
 (assert (= ~(,+ 1 2 3) [+ 1 2 3]) "bracket tuples are never function calls")
 
+# Metadata
+
+(def foo-with-tags :a-tag :bar)
+(assert (get (dyn 'foo-with-tags) :a-tag) "extra keywords in def are metadata tags")
+
+(def foo-with-meta {:baz :quux} :bar)
+(assert (= :quux (get (dyn 'foo-with-meta) :baz)) "extra struct in def is metadata")
+
+(defn foo-fn-with-meta {:baz :quux} "This is a function" [x] (identity x))
+(assert (= :quux (get (dyn 'foo-fn-with-meta) :baz)) "extra struct in defn is metadata")
+(assert (= "(foo-fn-with-meta x)\n\nThis is a function" (get (dyn 'foo-fn-with-meta) :doc)) "extra string in defn is docstring")
+
 (end-suite)