From 6cddd9ea714fe034466b4f02d3f7abb484c65ea0 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 23 Aug 2024 23:10:13 -0700
Subject: [PATCH] Make tail call expr mandatory

---
 src/expr.rs | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/expr.rs b/src/expr.rs
index 1d7c7bf4b5..d5c631ed37 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -2400,9 +2400,7 @@ pub(crate) mod parsing {
     fn expr_become(input: ParseStream) -> Result<Expr> {
         let begin = input.fork();
         input.parse::<Token![become]>()?;
-        if can_begin_expr(input) {
-            input.parse::<Expr>()?;
-        }
+        input.parse::<Expr>()?;
         Ok(Expr::Verbatim(verbatim::between(&begin, input)))
     }