[GR-18163] Support refinements for #to_s called by string interpolation (#2110).

PullRequest: truffleruby/2040

Author: eregon

CHANGELOG.md

@@ -41,6 +41,7 @@ Compatibility:
 * Fix arity for `Proc` (#2098, @ssnickolay)
 * Check bounds for `FFI::Pointer` accesses when the size of the memory behind is known. 
 * Implement negative line numbers for eval (#1482).
+* Support refinements for `#to_s` called by string interpolation (#2110, @ssnickolay)
 
 Performance:
 

spec/tags/core/module/refine_tags.txt

@@ -1,3 +1,2 @@
-fails:Module#refine for methods accessed indirectly is honored by string interpolation
 fails:Module#refine for methods accessed indirectly is honored by Kernel#respond_to?
 slow:Module#refine method lookup looks in the included modules for builtin methods

src/main/java/org/truffleruby/core/cast/ToSNode.java

@@ -34,7 +34,7 @@ protected RubyString toS(RubyString string) {
     @Specialization(guards = "!isRubyString(object)")
     protected RubyString toSFallback(VirtualFrame frame, Object object,
             @Cached DispatchNode callToSNode) {
-        final Object value = callToSNode.call(object, "to_s");
+        final Object value = callToSNode.dispatch(frame, object, "to_s", null, EMPTY_ARGUMENTS);
 
         if (value instanceof RubyString) {
             return (RubyString) value;