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, 13 insertions, 0 deletions

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index d79eb2b187..31925f3933 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -1961,6 +1961,19 @@ class TestRefinement < Test::Unit::TestCase
     end
   end
 
+  class ToString
+    c = self
+    using Module.new {refine(c) {def to_s; "ok"; end}}
+    def string
+      "#{self}"
+    end
+  end
+
+  def test_tostring
+    assert_equal("ok", ToString.new.string)
+    assert_predicate(ToString.new.taint.string, :tainted?)
+  end
+
   private
 
   def eval_using(mod, s)