1 files changed, 6 insertions, 0 deletions
diff --git a/src/wasm2js.h b/src/wasm2js.h
index c5fa54028..b1548c0ca 100644
--- a/src/wasm2js.h
+++ b/src/wasm2js.h
@@ -1115,6 +1115,9 @@ Ref Wasm2JSBuilder::processFunctionBody(Module* m,
     }
 
     Ref visitCall(Call* curr) {
+      if (curr->isReturn) {
+        Fatal() << "tail calls not yet supported in wasm2js";
+      }
       Ref theCall =
         ValueBuilder::makeCall(fromName(curr->target, NameScope::Top));
       // For wasm => wasm calls, we don't need coercions. TODO: even imports
@@ -1136,6 +1139,9 @@ Ref Wasm2JSBuilder::processFunctionBody(Module* m,
     }
 
     Ref visitCallIndirect(CallIndirect* curr) {
+      if (curr->isReturn) {
+        Fatal() << "tail calls not yet supported in wasm2js";
+      }
       // If the target has effects that interact with the operands, we must
       // reorder it to the start.
       bool mustReorder = false;