* parse.y (literal_concat0): tail can be nil. [ruby-dev:38980]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24356 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sun Aug  2 21:04:37 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (literal_concat0): tail can be nil.  [ruby-dev:38980]
+
 Sun Aug  2 20:09:07 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* array.c (rb_ary_combination, rb_ary_product): prevent from GC.

bootstraptest/test_syntax.rb

@@ -831,3 +831,8 @@ assert_normal_exit %q{
 assert_equal 'ok', %q{
   "#{}""#{}ok"
 }, '[ruby-dev:38968]'
+
+
+assert_equal 'ok', %q{
+  "o" "#{}k"
+}, '[ruby-dev:38980]'

parse.y

@@ -7782,6 +7782,7 @@ list_concat_gen(struct parser_params *parser, NODE *head, NODE *tail)
 static int
 literal_concat0(struct parser_params *parser, VALUE head, VALUE tail)
 {
+    if (NIL_P(tail)) return 1;
     if (!rb_enc_compatible(head, tail)) {
 	compile_error(PARSER_ARG "string literal encodings differ (%s / %s)",
 		      rb_enc_name(rb_enc_get(head)),