* NEWS: Add note about frozen string literals

* compile.c (case_when_optimizable_literal): optimize NODE_LIT strings
  in when clauses of case statements

* ext/ripper/eventids2.c: add tSTRING_SUFFIX

* parse.y: add 'f' suffix on string literals for frozen strings

* test/ripper/test_scanner_events.rb: add scanner tests

* test/ruby/test_string.rb: add frozen string tests

[Feature #8579] [ruby-core:55699]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42773 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 3f1ba30aea..5d142f1a7f 100644
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,8 @@ with all sufficient information, see the ChangeLog file.
 
 * def-expr now returns the symbol of its name instead of nil.
 
+* Added 'f' suffix for string literals that returns a frozen String object.
+
 === Core classes updates (outstanding ones only)
 
 * Bignum