Allow `-> do rescue; end` as well as `proc do rescue; end`

https://twitter.com/takiuchi/status/950593389963051008

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61710 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -3453,7 +3453,7 @@ lambda_body	: tLAMBEG compstmt '}'
 			token_info_pop("}");
 			$$ = $2;
 		    }
-		| keyword_do_LAMBDA compstmt k_end
+		| keyword_do_LAMBDA bodystmt k_end
 		    {
 			$$ = $2;
 		    }

test/ruby/test_syntax.rb

@@ -1128,6 +1128,24 @@ eom
     assert_equal(:begin, result)
   end
 
+  def test_rescue_do_end_ensure_in_lambda
+    result = []
+    eval("#{<<-"begin;"}\n#{<<-"end;"}")
+    begin;
+      -> do
+        result << :begin
+        raise "An exception occurred!"
+      rescue
+        result << :rescue
+      else
+        result << :else
+      ensure
+        result << :ensure
+      end.call
+    end;
+    assert_equal([:begin, :rescue, :ensure], result)
+  end
+
   def test_return_in_loop
     obj = Object.new
     def obj.test