Add anyref feature and type (#3109)

Adds `anyref` type, which is enabled by a new feature `--enable-anyref`. This type is primarily used for testing that passes correctly handle subtype relationships so that the codebase will continue to be prepared for future subtyping. Since `--enable-anyref` is meaningless without also using `--enable-reference-types`, this PR also makes it a validation error to pass only the former (and similarly makes it a validation error to enable exception handling without enabling reference types).

1 files changed, 3 insertions, 1 deletions

diff --git a/test/binaryen.js/event.js b/test/binaryen.js/event.js
index 64d7659b8..f705edc38 100644
--- a/test/binaryen.js/event.js
+++ b/test/binaryen.js/event.js
@@ -7,7 +7,9 @@ function cleanInfo(info) {
 }
 
 var module = new binaryen.Module();
-module.setFeatures(binaryen.Features.ExceptionHandling | binaryen.Features.Multivalue);
+module.setFeatures(binaryen.Features.ReferenceTypes |
+                   binaryen.Features.ExceptionHandling |
+                   binaryen.Features.Multivalue);
 
 var pairType = binaryen.createType([binaryen.i32, binaryen.f32]);