* 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, 1 deletions

diff --git a/compile.c b/compile.c
index bed329881e..92791f82a2 100644
--- a/compile.c
+++ b/compile.c
@@ -2504,7 +2504,8 @@ case_when_optimizable_literal(NODE * node)
 	    modf(RFLOAT_VALUE(v), &ival) == 0.0) {
 	    return FIXABLE(ival) ? LONG2FIX((long)ival) : rb_dbl2big(ival);
 	}
-	if (SYMBOL_P(v) || rb_obj_is_kind_of(v, rb_cNumeric)) {
+	if (SYMBOL_P(v) || RB_TYPE_P(v, T_STRING) ||
+	    rb_obj_is_kind_of(v, rb_cNumeric)) {
 	    return v;
 	}
 	break;