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

ChangeLog

@@ -1,3 +1,8 @@
+Wed Mar 16 20:03:35 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* proc.c (proc_binding): proc from symbol can not make a binding.
+	  [ruby-core:74100] [Bug #12137]
+
 Wed Mar 16 18:42:45 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* test/ruby/enc/test_case_mapping.rb: Fixed and activated a test for Cherokee.

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");
 	}
     }

test/ruby/test_symbol.rb

@@ -176,6 +176,15 @@ class TestSymbol < Test::Unit::TestCase
     end;
   end
 
+  def test_to_proc_binding
+    assert_separately([], <<~"end;", timeout: 1) # do
+      bug12137 = '[ruby-core:74100] [Bug #12137]'
+      assert_raise(ArgumentError, bug12137) {
+        :succ.to_proc.binding
+      }
+    end;
+  end
+
   def test_call
     o = Object.new
     def o.foo(x, y); x + y; end