basic: NEXT of FOR loop now works but now unary op is not parsed correctly

assets/tbas/syntax.txt

@@ -11,7 +11,7 @@ stmt =
     | "DEFUN" , [ident] , "(" , [ident , {" , " , ident}] , ")" , "=" , expr
     | "ON" , expr_sans_asgn , ("GOTO" | "GOSUB") , expr_sans_asgn , {"," , expr_sans_asgn}
     | "(" , stmt , ")"
-    | expr ;
+    | expr ; (* if the statement contains only one word, treat it as function_call e.g. NEXT for FOR loop *)
     
 expr = (* this basically blocks some funny attemps such as using DEFUN as anon function because everything is global in BASIC *)
       lit