* vm.c (vm_make_proc_from_block): should convert a Symbol to a Proc.

  [ruby-core:72083] [Bug #11811]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53152 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 16 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 670ad280fd..920bbda87c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Dec 16 19:30:56 2015  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* vm.c (vm_make_proc_from_block): should convert a Symbol to a Proc.
+	  [ruby-core:72083] [Bug #11811]
+
 Wed Dec 16 16:17:34 2015  Eric Wong  <e@80x24.org>
 
 	* test/ruby/test_io.rb: fix spelling errors
diff --git a/test/ruby/test_lazy_enumerator.rb b/test/ruby/test_lazy_enumerator.rb
index 29c6b3e855..5feddd5bde 100644
--- a/test/ruby/test_lazy_enumerator.rb
+++ b/test/ruby/test_lazy_enumerator.rb
@@ -532,4 +532,11 @@ EOS
     assert_warning("") {le.drop(1).force}
     assert_warning("") {le.drop_while{false}.force}
   end
+
+  def test_symbol_chain
+    assert_equal(["1", "3"], [1, 2, 3].lazy.reject(&:even?).map(&:to_s).force)
+    assert_raise(NoMethodError) do
+      [1, 2, 3].lazy.map(&:undefined).map(&:to_s).force
+    end
+  end
 end
diff --git a/vm.c b/vm.c
index 087cba7250..a03e068780 100644
--- a/vm.c
+++ b/vm.c
@@ -567,6 +567,10 @@ vm_make_proc_from_block(rb_thread_t *th, rb_block_t *block, VALUE *procptr)
 	*procptr = block->proc = rb_vm_make_proc(th, block, rb_cProc);
 	return TRUE;
     }
+    else if (SYMBOL_P(block->proc)) {
+	*procptr = rb_sym_to_proc(block->proc);
+	return TRUE;
+    }
     else {
 	*procptr = block->proc;
 	return FALSE;