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Pretty-print own args of existential projections (dyn-Trait w/ GAT constraints) - #129395

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Pretty-print own args of existential projections (dyn-Trait w/ GAT constraints)#129395
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@fmeasefmease commented Aug 22, 2024

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Previously we would just drop them. This bug isn't that significant as it can only be triggered by user code that constrains GATs inside trait object types which is currently gated under the interim feature generic_associated_types_extended (whose future is questionable) or on stable if the GATs are 'disabled' in dyn-Trait via where Self: Sized (in which case the assoc type bindings get ignored anyway (and trigger the warn-by-default lint unused_associated_type_bounds)), so yeah.

Affects diagnostics and output of std::any::type_name{,_of_val}.

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@rustbotrustbot 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 Aug 22, 2024
Comment threadcompiler/rustc_middle/src/ty/print/pretty.rs

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fmeaseforce-pushed the pp-dyn-w-gat branch 2 times, most recently from 4cdaa97 to 43063ebCompareAugust 22, 2024 04:21
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@bors r=compiler-errors rollup

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📌 Commit 080c2ca has been approved by compiler-errors

It is now in the queue for this repository.

@borsbors 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 Aug 22, 2024
bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 22, 2024
…iaskrgr
Rollup of 8 pull requests
Successful merges:
- rust-lang#128432 (WASI: forbid `unsafe_op_in_unsafe_fn` for `std::{os, sys}`)
- rust-lang#129373 (Add missing module flags for CFI and KCFI sanitizers)
- rust-lang#129374 (Use `assert_unsafe_precondition!` in `AsciiChar::digit_unchecked`)
- rust-lang#129376 (Change `assert_unsafe_precondition` docs to refer to `check_language_ub`)
- rust-lang#129382 (Add `const_cell_into_inner` to `OnceCell`)
- rust-lang#129387 (Advise against removing the remaining Python scripts from `tests/run-make`)
- rust-lang#129388 (Do not rely on names to find lifetimes.)
- rust-lang#129395 (Pretty-print own args of existential projections (dyn-Trait w/ GAT constraints))
r? `@ghost`
`@rustbot` modify labels: rollup
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Aug 22, 2024
Rollup merge of rust-lang#129395 - fmease:pp-dyn-w-gat, r=compiler-errors
Pretty-print own args of existential projections (dyn-Trait w/ GAT constraints)
Previously we would just drop them. This bug isn't that significant as it can only be triggered by user code that constrains GATs inside trait object types which is currently gated under the interim feature `generic_associated_types_extended` (whose future is questionable) or on stable if the GATs are 'disabled' in dyn-Trait via `where Self: Sized` (in which case the assoc type bindings get ignored anyway (and trigger the warn-by-default lint `unused_associated_type_bounds`)), so yeah.
Affects diagnostic output and output of `std::any::type_name{_of_val}`.
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bors merged commit 9d39b59 into rust-lang:masterAug 22, 2024
@rustbotrustbot added this to the 1.82.0 milestone Aug 22, 2024
@fmease
fmease deleted the pp-dyn-w-gat branch August 22, 2024 14:12
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