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65de5d0472
rust/compiler
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Matthias Krüger 65de5d0472
Rollup merge of #127871 - compiler-errors:recursive, r=estebank 
Mention that type parameters are used recursively on bivariance error

Right now when a type parameter is used recursively, even with indirection (so it has a finite size) we say that the type parameter is unused:

```
struct B<T>(Box<B<T>>);
```

This is confusing, because the type parameter is *used*, it just doesn't have its variance constrained. This PR tweaks that message to mention that it must be used *non-recursively*.

Not sure if we should actually mention "variance" here, but also I'd somewhat prefer we don't keep the power users in the dark w.r.t the real underlying issue, which is that the variance isn't constrained. That technical detail is reserved for a note, though.

cc `@fee1-dead`

Fixes #118976
Fixes #26283
Fixes #53191
Fixes #105740
Fixes #110466
2024-07-18 23:05:22 +02:00
..
rustc The rustc crate feature is called jemalloc 2024-07-15 13:01:20 -04:00
rustc_abi Rollup merge of #127769 - compiler-errors:ed-2024-dep, r=oli-obk 2024-07-17 16:22:31 +02:00
rustc_arena Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_ast Rollup merge of #127806 - nnethercote:parser-improvements, r=spastorino 2024-07-17 19:53:27 -05:00
rustc_ast_ir Use dep: for crate dependencies 2024-07-15 12:40:10 -04:00
rustc_ast_lowering Delegation: support coercion for target expression 2024-07-16 18:03:15 +03:00
rustc_ast_passes Rollup merge of #126762 - compiler-errors:kw-lt, r=michaelwoerister 2024-07-16 16:15:15 -05:00
rustc_ast_pretty Rollup merge of #127092 - compiler-errors:rtn-dots-redux, r=estebank 2024-07-03 23:30:07 +02:00
rustc_attr Use a dedicated type instead of a reference for the diagnostic context 2024-06-18 15:42:11 +00:00
rustc_baked_icu_data Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_borrowck Rollup merge of #127810 - compiler-errors:less-tcx, r=lcnr 2024-07-18 08:09:00 +02:00
rustc_builtin_macros Rollup merge of #127308 - nnethercote:Attribute-cleanups, r=petrochenkov 2024-07-07 14:22:01 +02:00
rustc_codegen_cranelift Rollup merge of #124033 - bjorn3:ar_archive_writer_0_3_0, r=davidtwco 2024-07-16 16:15:13 -05:00
rustc_codegen_gcc Format cg_gcc with same formatting parameters 2024-07-17 20:22:07 +02:00
rustc_codegen_llvm Rollup merge of #124033 - bjorn3:ar_archive_writer_0_3_0, r=davidtwco 2024-07-16 16:15:13 -05:00
rustc_codegen_ssa valtree construction: keep track of which type was valtree-incompatible 2024-07-18 11:58:16 +02:00
rustc_const_eval valtree construction: keep track of which type was valtree-incompatible 2024-07-18 11:58:16 +02:00
rustc_data_structures Use dep: for crate dependencies 2024-07-15 12:40:10 -04:00
rustc_driver Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_driver_impl Move codegen_and_build_linker from Queries to Linker 2024-07-01 11:00:49 +00:00
rustc_error_codes avoid creating an Instance only to immediately disassemble it again 2024-07-18 11:58:16 +02:00
rustc_error_messages Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_errors Rollup merge of #120248 - WaffleLapkin:bonk-ptr-object-casts, r=compiler-errors,oli-obk,lnicola 2024-07-08 16:28:15 +02:00
rustc_expand Rollup merge of #127542 - c410-f3r:concat-again, r=petrochenkov 2024-07-17 19:53:25 -05:00
rustc_feature Rollup merge of #127630 - compiler-errors:type-ascription, r=chenyukang 2024-07-14 20:24:59 +02:00
rustc_fluent_macro Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_fs_util Remove useless tidy-alphabetical markers. 2024-06-20 09:23:20 +10:00
rustc_graphviz Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_hir Stop using the gen keyword in the compiler 2024-07-14 14:01:01 -04:00
rustc_hir_analysis Rollup merge of #127871 - compiler-errors:recursive, r=estebank 2024-07-18 23:05:22 +02:00
rustc_hir_pretty implement new effects desugaring 2024-06-28 10:57:35 +00:00
rustc_hir_typeck Rollup merge of #125042 - long-long-float:suggest-move-arg-outside, r=fmease 2024-07-17 16:22:26 +02:00
rustc_incremental Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_index Fix feature gating on rustc_index to not use implicit features 2024-07-15 12:44:24 -04:00
rustc_index_macros Remove usage of specialization from newtype_index! 2024-06-30 16:42:53 +00:00
rustc_infer valtree construction: keep track of which type was valtree-incompatible 2024-07-18 11:58:16 +02:00
rustc_interface Use dep: for crate dependencies 2024-07-15 12:40:10 -04:00
rustc_lexer Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_lint Rollup merge of #127854 - fmease:glob-import-type_ir_inherent-lint, r=compiler-errors 2024-07-18 18:10:16 +02:00
rustc_lint_defs make pub_use_of_private_extern_crate show up in future breakage reports 2024-07-18 13:43:56 +02:00
rustc_llvm Rollup merge of #124033 - bjorn3:ar_archive_writer_0_3_0, r=davidtwco 2024-07-16 16:15:13 -05:00
rustc_log Bump tracing-tree and allow rendering lines again 2024-06-12 10:11:41 +00:00
rustc_macros lift_to_tcx -> lift_to_interner 2024-07-17 10:46:10 -04:00
rustc_metadata report pat no field error no recoverd struct variant 2024-07-11 00:18:47 +08:00
rustc_middle pattern lowering: make sure we never call user-defined PartialEq instances 2024-07-18 11:58:16 +02:00
rustc_mir_build Rollup merge of #127858 - Zalathar:pair-tree, r=Nadrieril 2024-07-18 23:05:22 +02:00
rustc_mir_dataflow Stop using the gen keyword in the compiler 2024-07-14 14:01:01 -04:00
rustc_mir_transform coverage: Restrict ExpressionUsed simplification to Code mappings 2024-07-15 20:54:28 +10:00
rustc_monomorphize Auto merge of #113128 - WaffleLapkin:become_trully_unuwuable, r=oli-obk,RalfJung 2024-07-08 04:35:04 +00:00
rustc_next_trait_solver Use dep: for crate dependencies 2024-07-15 12:40:10 -04:00
rustc_parse Rollup merge of #127835 - estebank:issue-127823, r=compiler-errors 2024-07-18 23:05:21 +02:00
rustc_parse_format Use tidy to sort crate attributes for all compiler crates. 2024-06-12 15:49:10 +10:00
rustc_passes Report usage of lib features in ast validation 2024-07-10 16:53:41 -04:00
rustc_pattern_analysis pattern lowering: make sure we never call user-defined PartialEq instances 2024-07-18 11:58:16 +02:00
rustc_privacy Do not ICE in privacy when type inference fails. 2024-06-17 10:09:27 +00:00
rustc_query_impl Allow tracing through item_bounds query invocations on opaques 2024-06-19 08:47:55 +00:00
rustc_query_system Use dep: for crate dependencies 2024-07-15 12:40:10 -04:00
rustc_resolve Auto merge of #117967 - adetaylor:fix-lifetime-elision-bug, r=lcnr 2024-07-18 13:33:38 +00:00
rustc_sanitizers Split out IntoIterator and non-Iterator constructors for AliasTy/AliasTerm/TraitRef/projection 2024-06-24 11:28:21 -04:00
rustc_serialize chore: remove duplicate words 2024-07-02 11:25:31 +08:00
rustc_session Auto merge of #127670 - compiler-errors:no-type-length-limit, r=jackh726 2024-07-14 12:44:07 +00:00
rustc_smir Avoid comments that describe multiple use items. 2024-07-17 08:02:46 +10:00
rustc_span Rollup merge of #127854 - fmease:glob-import-type_ir_inherent-lint, r=compiler-errors 2024-07-18 18:10:16 +02:00
rustc_symbol_mangling Fix FnMut/Fn shim for coroutine-closures that capture references 2024-06-29 17:38:02 -04:00
rustc_target cleanup: remove support for 3DNow! cpu features 2024-07-17 11:45:02 -04:00
rustc_trait_selection const_to_pat: cleanup leftovers from when we had to deal with non-structural constants 2024-07-18 11:58:16 +02:00
rustc_traits Split out overflow handling into its own module 2024-07-09 09:51:56 -04:00
rustc_transmute Use dep: for crate dependencies 2024-07-15 12:40:10 -04:00
rustc_ty_utils Auto merge of #123351 - beetrees:x86-ret-snan-rust, r=nikic,workingjubilee 2024-07-12 20:36:43 +00:00
rustc_type_ir Rollup merge of #127854 - fmease:glob-import-type_ir_inherent-lint, r=compiler-errors 2024-07-18 18:10:16 +02:00
rustc_type_ir_macros lift_to_tcx -> lift_to_interner 2024-07-17 10:46:10 -04:00
stable_mir Remove extern "wasm" ABI 2024-07-11 12:20:26 +02:00