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Avoid double lowering of idents #138588

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merged 4 commits into from
Mar 17, 2025

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nnethercote
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It's easy to double lower idents and spans because they don't change type when lowered.

r? @cjgillot

`LoweringContext::new_named_lifetime` lowers the `ident` passed in. Both
of its call sites *also* lower `ident` *before* passing it in. I.e. both
call sites cause the ident to be lowered twice. This commit removes the
lowering at the two call sites, so the ident is only lowered once.
`lower_generic_bound_predicate` calls `lower_ident`, and then passes the
lowered ident into `new_named_lifetime`, which lowers it again. This
commit avoids the first lowering. This requires adding a `lower_ident`
call on a path that doesn't involve `new_named_lifetime`.
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Mar 17, 2025
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r? compiler-errors @bors r+ rollup

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bors commented Mar 17, 2025

📌 Commit adf2bb7 has been approved by compiler-errors

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 17, 2025
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 17, 2025
…iaskrgr

Rollup of 7 pull requests

Successful merges:

 - rust-lang#133870 (Stabilize `asm_goto` feature gate)
 - rust-lang#137449 (Denote `ControlFlow` as `#[must_use]`)
 - rust-lang#137465 (mir_build: Avoid some useless work when visiting "primary" bindings)
 - rust-lang#138349 (Emit function declarations for functions with `#[linkage="extern_weak"]`)
 - rust-lang#138412 (Install licenses into `share/doc/rust/licenses`)
 - rust-lang#138577 (rustdoc-json: Don't also include `#[deprecated]` in `Item::attrs`)
 - rust-lang#138588 (Avoid double lowering of idents)

Failed merges:

 - rust-lang#138321 ([bootstrap] Distribute split debuginfo if present)

r? `@ghost`
`@rustbot` modify labels: rollup
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Mar 17, 2025
Rollup merge of rust-lang#138588 - nnethercote:avoid-double-lower_ident, r=compiler-errors

Avoid double lowering of idents

It's easy to double lower idents and spans because they don't change type when lowered.

r? `@cjgillot`
@bors bors merged commit 1e58d51 into rust-lang:master Mar 17, 2025
6 checks passed
@rustbot rustbot added this to the 1.87.0 milestone Mar 17, 2025
@nnethercote nnethercote deleted the avoid-double-lower_ident branch March 18, 2025 02:58
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5 participants