proc.c: fix infinite loop

* proc.c (bind_local_variables): update env from envval for each
  iterations.  [ruby-dev:48351] [Bug #10001]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46645 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Jul  2 02:14:37 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* proc.c (bind_local_variables): update env from envval for each
+	  iterations.  [ruby-dev:48351] [Bug #10001]
+
 Tue Jul  1 23:46:34 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* NEWS: [DOC] mention about Binding#local_variables, introduced at

proc.c

@@ -476,12 +476,13 @@ bind_local_variables(VALUE bindval)
     GetBindingPtr(bindval, bind);
 
     envval = bind->env;
-    GetEnvPtr(envval, env);
 
     do {
 	const rb_iseq_t *iseq;
 	int i;
 	ID id;
+
+	GetEnvPtr(envval, env);
 	iseq = env->block.iseq;
 
 	for (i = 0; i < iseq->local_table_size; i++) {

test/ruby/test_proc.rb

@@ -1256,6 +1256,11 @@ class TestProc < Test::Unit::TestCase
     assert_equal(%i[if case when begin end a], b.local_variables)
   end
 
+  def test_local_variables_nested
+    b = tap {break binding}
+    assert_equal(%i[b], b.local_variables, '[ruby-dev:48351] [Bug #10001]')
+  end
+
   def local_variables_of(bind)
     this_should_not_be_in_bind = 2
     bind.local_variables