String for string literal is not resizable

1 files changed, 10 insertions, 0 deletions

diff --git a/ext/-test-/string/fstring.c b/ext/-test-/string/fstring.c
index 2374319fe3..7ee14a8570 100644
--- a/ext/-test-/string/fstring.c
+++ b/ext/-test-/string/fstring.c
@@ -1,5 +1,6 @@
 #include "ruby.h"
 #include "ruby/encoding.h"
+#include "internal/string.h"
 
 VALUE rb_fstring(VALUE str);
 
@@ -10,6 +11,14 @@ bug_s_fstring(VALUE self, VALUE str)
 }
 
 VALUE
+bug_s_fstring_fake_str(VALUE self)
+{
+    static const char literal[] = "abcdefghijklmnopqrstuvwxyz";
+    struct RString fake_str;
+    return rb_fstring(rb_setup_fake_str(&fake_str, literal, sizeof(literal) - 1, 0));
+}
+
+VALUE
 bug_s_rb_enc_interned_str(VALUE self, VALUE encoding)
 {
     return rb_enc_interned_str("foo", 3, RDATA(encoding)->data);
@@ -25,6 +34,7 @@ void
 Init_string_fstring(VALUE klass)
 {
     rb_define_singleton_method(klass, "fstring", bug_s_fstring, 1);
+    rb_define_singleton_method(klass, "fstring_fake_str", bug_s_fstring_fake_str, 0);
     rb_define_singleton_method(klass, "rb_enc_interned_str", bug_s_rb_enc_interned_str, 1);
     rb_define_singleton_method(klass, "rb_enc_str_new", bug_s_rb_enc_str_new, 1);
 }