Landing: a085455306ec
Project / Subsystem
gcc / c++
Date
2026-07-01
Author
Jason Merrill
Commit
a085455306ec4aa15a11efacd994968bf951f7b6
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- c++
- patch_id
- —
- commit_hash
- a085455306ec4aa15a11efacd994968bf951f7b6
- source_type
- github
- headline
- C++: co_await and structured bindings: Fix guard variable lifetime.
- tldr
- Structured bindings used with `co_await` now correctly manage temporary guard variables.
- author
- Jason Merrill
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • c++
- • coroutines
- • structured bindings
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-01T00:00:00.000Z
This commit fixes an issue where temporary guard variables controlling the cleanup of structured binding variables were not surviving across co_await expressions. The problem stemmed from using TARGET_EXPR, which has a limited lifetime, to hold values that needed to persist as long as the structured binding itself. The solution uses get_temp_regvar for these guards and manually pushdecls them to ensure visibility and correct lifetime management, resolving PR124584.