Landing: e28d144e3492

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Project / Subsystem

gcc / c++

Date

2026-05-20

Author

Marek Polacek

Commit

e28d144e3492b93b5b09e365439758e7403a16d2

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: c++
patch_id: —
commit_hash: e28d144e3492b93b5b09e365439758e7403a16d2
source_type: github
headline: Fix ICE in variadic using-declaration with conversion functions.
tldr: Fixes an internal compiler error (ICE) when using variadic using-declarations with conversion functions due to incorrect argument rewriting.
author: Marek Polacek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++
• templates
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/e28d144e3492b93b5b09e365439758e7403a16d2
date: 2026-05-20T00:00:00.000Z

The compiler crashed when encountering a variadic using-declaration combined with a conversion function. The issue arose because the compiler was rewriting arguments incorrectly during template substitution, leading to unexpected identifier node types. The fix involves copying the arguments before modification to prevent unintended side effects. This issue was reported in PR125284 and PR125333.