From b3b91046dd62fee7a0975f2962732e71027f1c6c Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Sun, 14 Mar 2021 11:22:10 +0800
Subject: Make sure ill-form macro handle propely

---
 crates/mbe/src/expander/transcriber.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'crates/mbe')

diff --git a/crates/mbe/src/expander/transcriber.rs b/crates/mbe/src/expander/transcriber.rs
index c679e5e5d..dd7fa97d7 100644
--- a/crates/mbe/src/expander/transcriber.rs
+++ b/crates/mbe/src/expander/transcriber.rs
@@ -2,7 +2,7 @@
 //! `$ident => foo`, interpolates variables in the template, to get `fn foo() {}`
 
 use syntax::SmolStr;
-use tt::Delimiter;
+use tt::{Delimiter, Subtree};
 
 use super::ExpandResult;
 use crate::{
@@ -175,7 +175,10 @@ fn expand_repeat(
         counter += 1;
         if counter == limit {
             log::warn!("expand_tt in repeat pattern exceed limit => {:#?}\n{:#?}", template, ctx);
-            break;
+            return ExpandResult {
+                value: Fragment::Tokens(Subtree::default().into()),
+                err: Some(ExpandError::Other("Expand exceed limit".to_string())),
+            };
         }
 
         if e.is_some() {
-- 
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