Fix debug assert parsing {}=>{} when not executing (fix #2365)

Author: gfwilliams

ChangeLog

@@ -31,6 +31,7 @@
             Fix debug assert when reversing an array with non-integer elements (fix #2362)
             Fix debug assert when using instanceof if __proto__ was set to non-object (fix #2363)
             Fix debug assert when creating a function with code that isn't a string (fix #2364)
+            Fix debug assert parsing {}=>{} when not executing (fix #2365)
 
      2v17 : Bangle.js: When reading file info from a filename table, do it in blocks of 8 (20% faster file search)
             Bangle.js2: Increase flash buffer size from 16->32 bytes (5% performance increase)

src/jsparse.c

@@ -1601,9 +1601,11 @@ NO_INLINE JsVar *jspeAddNamedFunctionParameter(JsVar *funcVar, JsVar *name) {
 #ifndef ESPR_NO_ARROW_FN
 // parse an arrow function
 NO_INLINE JsVar *jspeArrowFunction(JsVar *funcVar, JsVar *a) {
-  assert(!a || jsvIsName(a));
   JSP_ASSERT_MATCH(LEX_ARROW_FUNCTION);
-  funcVar = jspeAddNamedFunctionParameter(funcVar, a);
+  if (JSP_SHOULD_EXECUTE) {
+    assert(!a || jsvIsName(a));
+    funcVar = jspeAddNamedFunctionParameter(funcVar, a);
+  }
 
   bool expressionOnly = lex->tk!='{';
   bool fnIncludesThis = jspeFunctionDefinitionInternal(funcVar, expressionOnly);