diff options
Diffstat (limited to 'eval.c')
-rw-r--r-- | eval.c | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -1135,6 +1135,26 @@ rb_using_module(NODE *cref, VALUE module) rb_hash_foreach(refinements, using_refinement, (VALUE) cref); } + +static int +check_cyclic_using(VALUE mod, VALUE _, VALUE search) +{ + VALUE using_modules; + ID id_using_modules; + CONST_ID(id_using_modules, "__using_modules__"); + + if (mod == search) { + rb_raise(rb_eArgError, "cyclic using detected"); + } + + using_modules = rb_attr_get(mod, id_using_modules); + if (!NIL_P(using_modules)) { + rb_hash_foreach(using_modules, check_cyclic_using, search); + } + + return ST_CONTINUE; +} + /* * call-seq: * using(module) -> self @@ -1150,6 +1170,7 @@ rb_mod_using(VALUE self, VALUE module) VALUE using_modules; Check_Type(module, T_MODULE); + check_cyclic_using(module, 0, self); CONST_ID(id_using_modules, "__using_modules__"); using_modules = rb_attr_get(self, id_using_modules); if (NIL_P(using_modules)) { |