Fix `mod.constants` not to have duplicate constant names;
The fix was based on PR from
MODIFY
src/variable.c
src/variable.c
@@ -882,8 +882,16 @@ const_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)
ary = *(mrb_value*)p;
s = mrb_sym2name_len(mrb, sym, &len);
if (len >= 1 && ISUPPER(s[0])) {
+ mrb_int i, alen = RARRAY_LEN(ary);
+
+ for (i=0; i<alen; i++) {
+ if (mrb_symbol(RARRAY_PTR(ary)[i]) == sym)
+ break;
+ }
+ if (i==alen) {
mrb_ary_push(mrb, ary, mrb_symbol_value(sym));
}
+ }
return 0;
}

Fix `mod.constants` not to have duplicate constant names; #4698

The fix was based on PR from @dearblue