Check maximum number of formal arguments.
(Japanese)
MODIFY
mrbgems/mruby-compiler/core/codegen.c
mrbgems/mruby-compiler/core/codegen.c
@@ -666,6 +666,9 @@ lambda_body(codegen_scope *s, node *tree, int blk)
ka = kd = 0;
ba = tree->car->cdr->cdr->cdr->cdr ? 1 : 0;
+ if (ma > 0x1f || oa > 0x1f || pa > 0x1f || ka > 0x1f) {
+ codegen_error(s, "too many formal arguments");
+ }
a = ((mrb_aspec)(ma & 0x1f) << 18)
| ((mrb_aspec)(oa & 0x1f) << 13)
| ((ra & 1) << 12)

Check maximum number of formal arguments.

http://hkdnet.hatenablog.com/entry/2017/02/06/080000 (Japanese)