parse.y: refine error messages

* parse.y (parser_read_escape, parser_tok_hex): refine error
  messages.  point from the backslash up to the invalid char.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59341 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 4 deletions

diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index d6850f4bfd..46d9470287 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -484,21 +484,27 @@ class TestParse < Test::Unit::TestCase
   end
 
   def test_string
-    assert_raise(SyntaxError) do
+    mesg = 'from the backslash through the invalid char'
+
+    e = assert_raise_with_message(SyntaxError, /hex escape/) do
       eval '"\xg1"'
     end
+    assert_equal('   ^', e.message.lines.last, mesg)
 
-    assert_raise(SyntaxError) do
+    e = assert_raise(SyntaxError) do
       eval '"\u{1234"'
     end
+    assert_match(' ^~~~~~~', e.message.lines.last, mesg)
 
-    assert_raise(SyntaxError) do
+    e = assert_raise_with_message(SyntaxError, /escape character syntax/) do
       eval '"\M1"'
     end
+    assert_equal(' ^~~', e.message.lines.last, mesg)
 
-    assert_raise(SyntaxError) do
+    e = assert_raise_with_message(SyntaxError, /escape character syntax/) do
       eval '"\C1"'
     end
+    assert_equal(' ^~~', e.message.lines.last, mesg)
 
     assert_equal("\x81", eval('"\C-\M-a"'))
     assert_equal("\177", eval('"\c?"'))