1 files changed, 11 insertions, 1 deletions
diff --git a/src/parser/wast-parser.cpp b/src/parser/wast-parser.cpp
index a3a6c14ce..00269a577 100644
--- a/src/parser/wast-parser.cpp
+++ b/src/parser/wast-parser.cpp
@@ -25,7 +25,17 @@ using namespace std::string_view_literals;
 namespace {
 
 Result<Literal> const_(Lexer& in) {
-  // TODO: handle `ref.extern n` as well.
+  if (in.takeSExprStart("ref.extern"sv)) {
+    auto n = in.takeI32();
+    if (!n) {
+      return in.err("expected host reference payload");
+    }
+    if (!in.takeRParen()) {
+      return in.err("expected end of ref.extern");
+    }
+    // Represent host references as externalized i31s.
+    return Literal::makeI31(*n, Unshared).externalize();
+  }
   return parseConst(in);
 }