refinements in string interpolation

* compile.c (iseq_compile_each0): insert to_s method call, so that
  refinements activated at the caller should take place.
  [Feature #13812]

* insns.def (tostring): fix up converted object to a string,
  infect and fallback.

* insns.def (branchiftype): new instruction for conversion.
  branches if TOS is an instance of the given type.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59950 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/string.c b/string.c
index c32b363324..bbd23669e6 100644
--- a/string.c
+++ b/string.c
@@ -1404,6 +1404,8 @@ str_shared_replace(VALUE str, VALUE str2)
     }
 }
 
+VALUE rb_obj_as_string_result(VALUE str, VALUE obj);
+
 VALUE
 rb_obj_as_string(VALUE obj)
 {
@@ -1413,6 +1415,12 @@ rb_obj_as_string(VALUE obj)
 	return obj;
     }
     str = rb_funcall(obj, idTo_s, 0);
+    return rb_obj_as_string_result(str, obj);
+}
+
+VALUE
+rb_obj_as_string_result(VALUE str, VALUE obj)
+{
     if (!RB_TYPE_P(str, T_STRING))
 	return rb_any_to_s(obj);
     if (!FL_TEST_RAW(str, RSTRING_FSTR) && FL_ABLE(obj))