Rust: HIR Cleanup and Incremental Build Fixes
Core compiler representations got simpler with unflattened use statements and leaner type checking state, while incremental compilation moved to fresh session directories. Diagnostics and ABI fixes round out the day.
Duration: PT2M57S
Episode overview
This episode is a short developer briefing from Rust.
It explains recent repository work in plain language.
- Show: Rust
- Published: 2026-09-25T13:13:04Z
- Audio duration: PT2M57S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning, it's September 25th, 2026.
The lead story is cleanup inside the compiler that should make future work more reliable, anchored by a new way of representing imports and a new approach to incremental builds.
First, simpler internals. Pull request 161349 stops flattening use statements in the high-level intermediate representation, so `use a colon colon b` with nested imports now mirrors the original syntax instead of duplicating shared prefixes and resolver data. That removes extra owners and sets up further…
Second, more predictable code generation. Pull request 159287, merged as commit f0f6653, builds a new incremental compilation session directory from scratch every time instead of copying the old one, saving copies and avoiding leftover artifacts from untracked files like thin link-time optimization bitcode. Open…
Third, correctness users can feel. Pull request 163096 stops lint suggestions from inserting standard library paths in no-standard-library crates where they would break the build. Pull request 160068 preserves explicit register names in inline assembly diagnostics, and pull request 163234 moves demangling output for…
What's next to watch is open pull request…
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