proc.c: fail symbol proc binding

* proc.c (proc_binding): proc from symbol can not make a binding.
  [ruby-core:74100] [Bug #12137]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54128 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/proc.c b/proc.c
index 6155dc0d35..8b1141a5d3 100644
--- a/proc.c
+++ b/proc.c
@@ -2658,6 +2658,7 @@ proc_binding(VALUE self)
     GetProcPtr(self, proc);
     envval = rb_vm_proc_envval(proc);
     iseq = proc->block.iseq;
+    if (SYMBOL_P(iseq)) goto error;
     if (RUBY_VM_IFUNC_P(iseq)) {
 	struct vm_ifunc *ifunc = (struct vm_ifunc *)iseq;
 	if (IS_METHOD_PROC_IFUNC(ifunc)) {
@@ -2666,6 +2667,7 @@ proc_binding(VALUE self)
 	    iseq = rb_method_iseq(method);
 	}
 	else {
+	  error:
 	    rb_raise(rb_eArgError, "Can't create Binding from C level Proc");
 	}
     }