Landing: 068936fe408e

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Project / Subsystem

gcc / gccrs

Date

2026-08-04

Author

Arthur Cohen

Commit

068936fe408e879fbd4332bb976b4904224642aa

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gccrs
patch_id: —
commit_hash: 068936fe408e879fbd4332bb976b4904224642aa
source_type: github
headline: gccrs: Correctly handle default type parameters in derived impls
tldr: gccrs: Fixes derive macro to not add default type parameters to impl blocks.
author: Arthur Cohen
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • gccrs
• rust
• derive
• generics
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/068936fe408e879fbd4332bb976b4904224642aa
date: 2026-08-04T00:00:00.000Z

The gccrs compiler now correctly handles type parameters when generating derived implementations. It avoids adding default type parameters to impl blocks, as these are only valid for type definitions, not implementations. This correction involves changes to the AST builder and the derive expansion logic, along with a new test case.