Fixed `Kernel#.eval` crash when given a custom defined `Binding` instance
```console
% bin/mruby -e 'class Binding; end; eval "1", Binding.new'
zsh: segmentation fault (core dumped)  bin/mruby -e 'class Binding; end; eval "1", Binding.new'
```
MODIFY
mrbgems/mruby-eval/src/eval.c
mrbgems/mruby-eval/src/eval.c
@@ -29,14 +29,14 @@ create_proc_from_string(mrb_state *mrb, const char *s, mrb_int len, mrb_value bi
mrb_obj_class(mrb, binding));
}
scope_obj = mrb_iv_get(mrb, binding, MRB_SYM(proc));
- mrb_assert(mrb_proc_p(scope_obj));
+ mrb_check_type(mrb, scope_obj, MRB_TT_PROC);
scope = mrb_proc_ptr(scope_obj);
if (MRB_PROC_CFUNC_P(scope)) {
e = NULL;
}
else {
mrb_value env = mrb_iv_get(mrb, binding, MRB_SYM(env));
- mrb_assert(mrb_env_p(env));
+ mrb_check_type(mrb, env, MRB_TT_ENV);
e = (struct REnv *)mrb_obj_ptr(env);
mrb_assert(e != NULL);
}

Fixed `Kernel#.eval` crash when given a custom defined `Binding` instance

```console
% bin/mruby -e 'class Binding; end; eval "1", Binding.new'
zsh: segmentation fault (core dumped)  bin/mruby -e 'class Binding; end; eval "1", Binding.new'
```