1 files changed, 1 insertions, 0 deletions
diff --git a/tools/js-optimizer.js b/tools/js-optimizer.js
index e567ebff..51a7bdeb 100644
--- a/tools/js-optimizer.js
+++ b/tools/js-optimizer.js
@@ -1593,6 +1593,7 @@ function normalizeAsm(func) {
         data.vars[name] = detectAsmCoercion(value);
         v.length = 1; // make an un-assigning var
       } else {
+        assert(j === 0, 'cannot break in the middle');
         break outer;
       }
     }