Fix rustdoc ICE when checking if a generic arg can be elided - #160295
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rustbot has assigned @GuillaumeGomez. Use Why was this reviewer chosen?The reviewer was selected based on:
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Please add a regression test. |
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GuillaumeGomez
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Jul 31, 2026
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Reminder, once the PR becomes ready for a review, use |
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@rustbot ready |
fmease
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Smaller reproducer:
trait Trait<T = ()> {
type Type<'a, 'b>;
}
struct Struct<T: Trait<()>>(T::Type<'static, 'static>);
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When I test locally these do not ICE for me. Do you have the backtrace?
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I was able to minimize it to this. I haven't been successful on reproducing the ICE with a struct.
trait Trait<Default = ()> {
type Type<'a, 'b>;
}
type Type<T> = <T as Trait>::Type<'static, 'static>;
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GuillaumeGomez
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Aug 3, 2026
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Thanks! @bors r+ rollup |
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JonathanBrouwer
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Fix rustdoc ICE when checking if a generic arg can be elided Fixes rust-lang#133637 The `param_at` call expects a index into the full generics list, while index is generated only from the children. I also noticed a call to `skip_norm_wip` so I replaced that with `skip_normalization` I have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today. @fmease
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…uwer Rollup of 21 pull requests Successful merges: - #159844 (Subtree cg_gcc sync (2026-07-24)) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160007 (allow `-Ldependency` search paths for panic runtimes) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #159014 ([rustdoc] Do not take `doc(cfg())` into account when filtering doctests) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160165 (reject `...` without pattern post-expansion) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance)
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Fix rustdoc ICE when checking if a generic arg can be elided Fixes rust-lang#133637 The `param_at` call expects a index into the full generics list, while index is generated only from the children. I also noticed a call to `skip_norm_wip` so I replaced that with `skip_normalization` I have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today. @fmease
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…uwer Rollup of 23 pull requests Successful merges: - #153749 (Account for ownership mismatch on argument that doesn't meet bound) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160007 (allow `-Ldependency` search paths for panic runtimes) - #160184 (Add -Zinstrument-mcount={fentry-nop-record,fentry-record}) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160011 (remove InterpError::map_err_info) - #160165 (reject `...` without pattern post-expansion) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance) - #160435 (bump tracing-tree)
JonathanBrouwer
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Fix rustdoc ICE when checking if a generic arg can be elided Fixes rust-lang#133637 The `param_at` call expects a index into the full generics list, while index is generated only from the children. I also noticed a call to `skip_norm_wip` so I replaced that with `skip_normalization` I have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today. @fmease
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…uwer Rollup of 26 pull requests Successful merges: - #153749 (Account for ownership mismatch on argument that doesn't meet bound) - #158727 (std: use `readdir` on nearly all UNIX platforms) - #159130 (a bit optimize four-digit chunks in integer formatting) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160184 (Add -Zinstrument-mcount={fentry-nop-record,fentry-record}) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160011 (remove InterpError::map_err_info) - #160165 (reject `...` without pattern post-expansion) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance) - #160412 (Move duplicate-names check for #[rustc_must_implement_one_of] to attribute parser) - #160435 (bump tracing-tree) - #160449 (Fix lookup of object files)
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Fix rustdoc ICE when checking if a generic arg can be elided Fixes rust-lang#133637 The `param_at` call expects a index into the full generics list, while index is generated only from the children. I also noticed a call to `skip_norm_wip` so I replaced that with `skip_normalization` I have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today. @fmease
jhpratt
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Fix rustdoc ICE when checking if a generic arg can be elided Fixes rust-lang#133637 The `param_at` call expects a index into the full generics list, while index is generated only from the children. I also noticed a call to `skip_norm_wip` so I replaced that with `skip_normalization` I have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today. @fmease
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Rollup of 28 pull requests Successful merges: - #153749 (Account for ownership mismatch on argument that doesn't meet bound) - #159130 (a bit optimize four-digit chunks in integer formatting) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160184 (Add -Zinstrument-mcount={fentry-nop-record,fentry-record}) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160011 (remove InterpError::map_err_info) - #160165 (reject `...` without pattern post-expansion) - #160172 (tests: Enable `feature(stmt_expr_attributes)` in `2229_closure_analysis` tests) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance) - #160412 (Move duplicate-names check for #[rustc_must_implement_one_of] to attribute parser) - #160427 (Run try builds on EC2 by default) - #160435 (bump tracing-tree) - #160449 (Fix lookup of object files) - #160477 (Update the tracking issue for `borrowed_buf_init`)
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Rollup of 28 pull requests Successful merges: - #153749 (Account for ownership mismatch on argument that doesn't meet bound) - #159130 (a bit optimize four-digit chunks in integer formatting) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160184 (Add -Zinstrument-mcount={fentry-nop-record,fentry-record}) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160011 (remove InterpError::map_err_info) - #160165 (reject `...` without pattern post-expansion) - #160172 (tests: Enable `feature(stmt_expr_attributes)` in `2229_closure_analysis` tests) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance) - #160412 (Move duplicate-names check for #[rustc_must_implement_one_of] to attribute parser) - #160427 (Run try builds on EC2 by default) - #160435 (bump tracing-tree) - #160449 (Fix lookup of object files) - #160477 (Update the tracking issue for `borrowed_buf_init`)
rust-bors Bot
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Rollup of 28 pull requests Successful merges: - #153749 (Account for ownership mismatch on argument that doesn't meet bound) - #159130 (a bit optimize four-digit chunks in integer formatting) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160184 (Add -Zinstrument-mcount={fentry-nop-record,fentry-record}) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160011 (remove InterpError::map_err_info) - #160165 (reject `...` without pattern post-expansion) - #160172 (tests: Enable `feature(stmt_expr_attributes)` in `2229_closure_analysis` tests) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance) - #160412 (Move duplicate-names check for #[rustc_must_implement_one_of] to attribute parser) - #160427 (Run try builds on EC2 by default) - #160435 (bump tracing-tree) - #160449 (Fix lookup of object files) - #160477 (Update the tracking issue for `borrowed_buf_init`)
rust-bors Bot
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Rollup of 29 pull requests Successful merges: - #153749 (Account for ownership mismatch on argument that doesn't meet bound) - #159130 (a bit optimize four-digit chunks in integer formatting) - #159326 (Deny multiple EII impls on a single item) - #159535 (Optimize slice::contains for bytewise types) - #159595 (Promote loongarch32-unknown-none* to Tier 2) - #160184 (Add -Zinstrument-mcount={fentry-nop-record,fentry-record}) - #160320 (point at trait definition when it is used as a derive macro) - #160369 (When suggesting method names, prefer *exact* doc aliases over similar names) - #160406 (`DepKind` cleanups) - #160424 (Use `thread::available_parallelism` as the default limit for backend parallelism) - #160434 (Avoid Docker push when the image did not change) - #159303 (Fix ICE for direct inline const generic defaults) - #159977 (Add regression test for bool indexing codegen) - #160011 (remove InterpError::map_err_info) - #160165 (reject `...` without pattern post-expansion) - #160172 (tests: Enable `feature(stmt_expr_attributes)` in `2229_closure_analysis` tests) - #160295 (Fix rustdoc ICE when checking if a generic arg can be elided) - #160305 (Linkify C-SKY targets in `platform-support.md`) - #160314 (fix borrowck ICE for consts with fn pointer type) - #160322 (ElaborateBoxDeref: remove unnecessary projection) - #160338 (Add regression test for supertrait associated type normalization through dyn) - #160340 (Add regression test for unused_parens on contract clauses) - #160371 (Add doc aliases for transpositions `read_exact_buf` and `read_exact_buf_at`) - #160384 (Add PR body notes for Cargo lock file maintenance) - #160412 (Move duplicate-names check for #[rustc_must_implement_one_of] to attribute parser) - #160427 (Run try builds on EC2 by default) - #160435 (bump tracing-tree) - #160449 (Fix lookup of object files) - #160477 (Update the tracking issue for `borrowed_buf_init`)
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Rollup merge of #160295 - Colepng:main, r=GuillaumeGomez Fix rustdoc ICE when checking if a generic arg can be elided Fixes #133637 The `param_at` call expects a index into the full generics list, while index is generated only from the children. I also noticed a call to `skip_norm_wip` so I replaced that with `skip_normalization` I have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today. @fmease
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Fixes #133637
The
param_atcall expects a index into the full generics list, while index is generated only from the children.I also noticed a call to
skip_norm_wipso I replaced that withskip_normalizationI have one question about adding the regression test, should it live under rustdoc-ui or rustdoc-ui/issue. I will add it later today.
@fmease