parse.y: fail if invalid name

* parse.y (parser_yylex): fail if $, @, @@ are not followed by a valid
  name character.  [ruby-core:54846] [Bug #8375].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40607 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 6 deletions

diff --git a/parse.y b/parse.y
index b677855821..a83f85f1f4 100644
--- a/parse.y
+++ b/parse.y
@@ -7876,7 +7876,8 @@ parser_yylex(struct parser_params *parser)
 	  default:
 	    if (!parser_is_identchar()) {
 		pushback(c);
-		return '$';
+		compile_error(PARSER_ARG "`$%c' is not allowed as a global variable name", c);
+		return 0;
 	    }
 	  case '0':
 	    tokadd('$');
@@ -7891,7 +7892,8 @@ parser_yylex(struct parser_params *parser)
 	    tokadd('@');
 	    c = nextc();
 	}
-	if (c != -1 && ISDIGIT(c)) {
+	if (c != -1 && (ISDIGIT(c) || !parser_is_identchar())) {
+	    pushback(c);
 	    if (tokidx == 1) {
 		compile_error(PARSER_ARG "`@%c' is not allowed as an instance variable name", c);
 	    }
@@ -7900,10 +7902,6 @@ parser_yylex(struct parser_params *parser)
 	    }
 	    return 0;
 	}
-	if (!parser_is_identchar()) {
-	    pushback(c);
-	    return '@';
-	}
 	break;
 
       case '_':