* include/ruby/ruby.h: add RSTRING_FSTR flag

* internal.h: add rb_fstring() prototype
* parse.y (str_suffix_gen): deduplicate frozen string literals
* string.c (rb_fstring): deduplicate frozen string literals
* string.c (rb_str_free): delete fstrings from frozen_strings table when
  they are GC'd
* string.c (Init_String): initialize frozen_strings table
* test/ruby/test_string.rb: test frozen strings are deduplicated

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42843 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 064e977e9a..d17591253c 100644
--- a/parse.y
+++ b/parse.y
@@ -8561,7 +8561,7 @@ str_suffix_gen(struct parser_params *parser, NODE *node, long opt)
 #endif
 #if STR_OPTION_FROZEN
 	if (opt & STR_OPTION_FROZEN) {
-	    OBJ_FREEZE(node->nd_lit);
+	    node->nd_lit = rb_fstring(node->nd_lit);
 	    nd_set_type(node, NODE_LIT);
 	}
 #endif