hash.c: key name in error message

* hash.c (env_fetch): Add key name to message on ENV.fetch KeyError,
  as well as Hash#fetch.  [ruby-core:56062] [Feature #8649]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42025 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Jul 17 17:12:23 2013  Matthew M. Boedicker  <matthewm@boedicker.org>
+
+	* hash.c (env_fetch): Add key name to message on ENV.fetch KeyError,
+	  as well as Hash#fetch.  [ruby-core:56062] [Feature #8649]
+
 Wed Jul 17 15:59:33 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: catch up last changes for debugging/checking mode.

hash.c

@@ -2411,7 +2411,7 @@ env_fetch(int argc, VALUE *argv)
     if (!env) {
 	if (block_given) return rb_yield(key);
 	if (argc == 1) {
-	    rb_raise(rb_eKeyError, "key not found");
+	    rb_raise(rb_eKeyError, "key not found: \"%"PRIsVALUE"\"", key);
 	}
 	return if_none;
     }

test/ruby/test_env.rb

@@ -103,7 +103,10 @@ class TestEnv < Test::Unit::TestCase
     ENV["test"] = "foo"
     assert_equal("foo", ENV.fetch("test"))
     ENV.delete("test")
-    assert_raise(KeyError) { ENV.fetch("test") }
+    feature8649 = '[ruby-core:56062] [Feature #8649]'
+    assert_raise_with_message(KeyError, 'key not found: "test"', feature8649) do
+      ENV.fetch("test")
+    end
     assert_equal("foo", ENV.fetch("test", "foo"))
     assert_equal("bar", ENV.fetch("test") { "bar" })
     assert_equal("bar", ENV.fetch("test", "foo") { "bar" })