delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition by aerooneqq · Pull Request #155031 · rust-lang/rust

aerooneqq · 2026-04-09T09:25:49Z

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This PR does two things:

First it restores lower_generic_args_of_path as it was before Implement AST -> HIR generics propagation in delegation #151864, as it turns out we should use GenericArgPosition::Type for generic args lowering for signature inheritance, as it will not cause lifetime inference and then ICEs during child args lowering,
Next it refactors GenericArgPosition enum replacing Value and MethodCall with Call(IsMethodCall), as the only place where we created Value or MethodCall variants was in check_generic_arg_count_for_call, where it was a match over is_method_call. Not sure it is needed, but seems cleaner to me.

Fixes #154178, part of #118212.

r? @petrochenkov

rustbot · 2026-04-09T09:25:55Z

HIR ty lowering was modified

cc @fmease

petrochenkov · 2026-04-09T12:00:17Z

@bors r+

rust-bors · 2026-04-09T12:00:21Z

📌 Commit 5eea9f8 has been approved by petrochenkov

It is now in the queue for this repository.

fmease

I'm sorry, one minor nit. @bors r-

View changes since this review

rustbot · 2026-04-09T12:15:21Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

aerooneqq · 2026-04-09T12:49:10Z

@rustbot ready

fmease · 2026-04-09T13:41:02Z

Thanks!

@bors r=petrochenkov,fmease rollup

rust-bors · 2026-04-09T13:41:06Z

📌 Commit 5a32e40 has been approved by petrochenkov,fmease

It is now in the queue for this repository.

@petrochenkov

…lowering-ice, r=petrochenkov,fmease delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition This PR does two things: - First it restores `lower_generic_args_of_path` as it was before rust-lang#151864, as it turns out we should use `GenericArgPosition::Type` for generic args lowering for signature inheritance, as it will not cause lifetime inference and then ICEs during child args lowering, - Next it refactors `GenericArgPosition` enum replacing `Value` and `MethodCall` with `Call(IsMethodCall)`, as the only place where we created `Value` or `MethodCall` variants was in `check_generic_arg_count_for_call`, where it was a match over `is_method_call`. Not sure it is needed, but seems cleaner to me. Fixes rust-lang#154178, part of rust-lang#118212. r? @petrochenkov

JonathanBrouwer · 2026-04-09T19:51:51Z

@bors r-
#155061 (comment)

rustbot · 2026-04-10T06:54:09Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

aerooneqq · 2026-04-10T07:04:37Z

@rustbot ready

JonathanBrouwer · 2026-04-10T09:18:35Z

@bors try jobs=x86_64-gnu-llvm-21-3

…e, r=<try> delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition try-job: x86_64-gnu-llvm-21-3

petrochenkov · 2026-04-10T11:10:27Z

r=me after CI is green.

petrochenkov · 2026-04-10T11:10:48Z

@rustbot author
@bors delegate+

rust-bors · 2026-04-10T11:10:52Z

✌️ @aerooneqq, you can now approve this pull request!

If @petrochenkov told you to "r=me" after making some further change, then please make that change and post @bors r=petrochenkov.

rust-bors · 2026-04-10T11:11:51Z

☀️ Try build successful (CI)
Build commit: 1e777aa (1e777aa357e03a51137afb68b540e903c1456c89, parent: 7659cec4ed1457bc0d1f636127e66e8fe5008928)

aerooneqq · 2026-04-10T11:18:34Z

@bors r+

rust-bors · 2026-04-10T11:18:38Z

📌 Commit 9e8069f has been approved by aerooneqq

It is now in the queue for this repository.

fmease · 2026-04-10T11:22:03Z

@bors r=petrochenkov

rust-bors · 2026-04-10T11:22:06Z

📌 Commit 9e8069f has been approved by petrochenkov

It is now in the queue for this repository.

@petrochenkov

…lowering-ice, r=petrochenkov delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition This PR does two things: - First it restores `lower_generic_args_of_path` as it was before rust-lang#151864, as it turns out we should use `GenericArgPosition::Type` for generic args lowering for signature inheritance, as it will not cause lifetime inference and then ICEs during child args lowering, - Next it refactors `GenericArgPosition` enum replacing `Value` and `MethodCall` with `Call(IsMethodCall)`, as the only place where we created `Value` or `MethodCall` variants was in `check_generic_arg_count_for_call`, where it was a match over `is_method_call`. Not sure it is needed, but seems cleaner to me. Fixes rust-lang#154178, part of rust-lang#118212. r? @petrochenkov

…uwer Rollup of 8 pull requests Successful merges: - #155047 (Always exhaustively match on typing mode) - #155080 (Simplify `try_load_from_disk_fn`.) - #152384 (Restrict EII declarations to functions at lowering time) - #153796 (Fix ICE when combining #[eii] with #[core::contracts::ensures]) - #154369 (Fix `pattern_from_macro_note` for bit-or expr) - #155027 ( Rename some more of our internal `#[rustc_*]` TEST attributes) - #155031 (delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition) - #155040 (Fix code block whitespace handling in Markdown)

@petrochenkov

Rollup merge of #155031 - aerooneqq:delegation-generic-args-lowering-ice, r=petrochenkov delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition This PR does two things: - First it restores `lower_generic_args_of_path` as it was before #151864, as it turns out we should use `GenericArgPosition::Type` for generic args lowering for signature inheritance, as it will not cause lifetime inference and then ICEs during child args lowering, - Next it refactors `GenericArgPosition` enum replacing `Value` and `MethodCall` with `Call(IsMethodCall)`, as the only place where we created `Value` or `MethodCall` variants was in `check_generic_arg_count_for_call`, where it was a match over `is_method_call`. Not sure it is needed, but seems cleaner to me. Fixes #154178, part of #118212. r? @petrochenkov

…uwer Rollup of 8 pull requests Successful merges: - rust-lang/rust#155047 (Always exhaustively match on typing mode) - rust-lang/rust#155080 (Simplify `try_load_from_disk_fn`.) - rust-lang/rust#152384 (Restrict EII declarations to functions at lowering time) - rust-lang/rust#153796 (Fix ICE when combining #[eii] with #[core::contracts::ensures]) - rust-lang/rust#154369 (Fix `pattern_from_macro_note` for bit-or expr) - rust-lang/rust#155027 ( Rename some more of our internal `#[rustc_*]` TEST attributes) - rust-lang/rust#155031 (delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition) - rust-lang/rust#155040 (Fix code block whitespace handling in Markdown)

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aerooneqq force-pushed the delegation-generic-args-lowering-ice branch from 1d62869 to 5eea9f8 Compare April 9, 2026 10:07

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fmease requested changes Apr 9, 2026

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Comment thread compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs Outdated

Comment thread compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs Outdated

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Comment thread tests/ui/delegation/generics/unelided-lifetime-ice-154178.rs Outdated

aerooneqq force-pushed the delegation-generic-args-lowering-ice branch from 5eea9f8 to 5a32e40 Compare April 9, 2026 12:47

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aerooneqq changed the title ~~delegation: fix unelided lifetime ICE, small refactoring of GenericArgPosition~~ delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition Apr 9, 2026

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JonathanBrouwer mentioned this pull request Apr 9, 2026

Rollup of 11 pull requests #155061

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Fix unelided lifetime ICE, refactoring of GenericArgPosition

9e8069f

aerooneqq force-pushed the delegation-generic-args-lowering-ice branch from 5a32e40 to 9e8069f Compare April 10, 2026 06:54

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rust-bors Bot pushed a commit that referenced this pull request Apr 10, 2026

Auto merge of #155031 - aerooneqq:delegation-generic-args-lowering-ic…

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…e, r=<try> delegation: fix unelided lifetime ICE, refactoring of GenericArgPosition try-job: x86_64-gnu-llvm-21-3

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Rollup of 5 pull requests #155094

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Rollup of 8 pull requests #155099

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rust-bors Bot merged commit 3b8c7ec into rust-lang:main Apr 10, 2026
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