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1023 Commits

Author SHA1 Message Date
Gary Guo
adf1717219 Ensure valid local_data is set for custom mir building 
MIR unsafety checking requires this to be valid
 2022-12-13 01:38:38 +00:00
Gary Guo
aa5af2a003 Allow unsafe through inline const for THIR unsafety checker 
The closure handling code is changed slightly to avoid allocation
when THIR building failed.
 2022-12-13 01:38:38 +00:00
Matthias Krüger
666366444c
Rollup merge of #105615 - WaffleLapkin:remove_opt_scope_span_mention, r=compiler-errors 
Fixup method doc that mentions removed param

The param was removed in https://github.com/rust-lang/rust/pull/61872 (101a2f59b4)
 2022-12-12 19:20:36 +01:00
Maybe Waffle
613c1216b7 Fixup method doc that mentions removed param 2022-12-12 15:43:04 +00:00
bors
2cd2070af7 Auto merge of #105160 - nnethercote:rm-Lit-token_lit, r=petrochenkov 
Remove `token::Lit` from `ast::MetaItemLit`.

Currently `ast::MetaItemLit` represents the literal kind twice. This PR removes that redundancy. Best reviewed one commit at a time.

r? `@petrochenkov`
 2022-12-12 05:16:50 +00:00
Matthias Krüger
2daa3bcbc2
Rollup merge of #105537 - kadiwa4:remove_some_imports, r=fee1-dead 
compiler: remove unnecessary imports and qualified paths

Some of these imports were necessary before Edition 2021, others were already in the prelude.

I hope it's fine that this PR is so spread-out across files :/
 2022-12-11 09:51:57 +01:00
KaDiWa
9bc69925cb
compiler: remove unnecessary imports and qualified paths 2022-12-10 18:45:34 +01:00
Jakob Degen
9fb8da8f8f Remove unneeded field from SwitchTargets 2022-12-09 04:53:10 -08:00
Matthias Krüger
3bcfa4c459
Rollup merge of #105267 - compiler-errors:issue-104613, r=oli-obk 
Don't ICE in ExprUseVisitor on FRU for non-existent struct

Fixes #104613
Fixes #105202
 2022-12-07 15:39:06 +01:00
Will Crichton
d595884302 Move -Z maximal-hir-to-mir-coverage implementation to new maybe_new_source_scope method 2022-12-05 12:47:44 -08:00
Michael Goulet
26b24cd755 drive-by: move field_index to typeck results 2022-12-04 17:59:21 +00:00
bors
fd02567705 Auto merge of #105121 - oli-obk:simpler-cheaper-dump_mir, r=nnethercote 
Cheaper `dump_mir` take two

alternative to #105083

r? `@nnethercote`
 2022-12-04 05:47:10 +00:00
Oli Scherer
c7e94b0efd Use zero based indexing for pass_count 2022-12-02 15:55:24 +00:00
Nicholas Nethercote
a7f35c42d4 Add StrStyle to ast::LitKind::ByteStr. 
This is required to distinguish between cooked and raw byte string
literals in an `ast::LitKind`, without referring to an adjacent
`token::Lit`. It's a prerequisite for the next commit.
 2022-12-02 10:38:58 +11:00
Jakob Degen
5a34dbf193 Improve spans in custom mir 2022-11-29 19:27:26 -08:00
Jakob Degen
52ce1f7697 Support statics in custom mir 2022-11-29 19:27:26 -08:00
Jakob Degen
7578100317 Support most constant kinds in custom mir 2022-11-29 19:26:04 -08:00
b-naber
dc93a28e98 reduce allocations 2022-11-29 13:42:52 +01:00
Maybe Waffle
f4d00fe785 Remove Const::from_value 
...it's just `mk_const` but without the sparcles
 2022-11-28 17:28:30 +00:00
Maybe Waffle
26b87bf8ff Simplify calls to tcx.mk_const 
`mk_const(ty::ConstKind::X(...), ty)` can now be simplified to
`mk_cosnt(...,                   ty)`.

I searched with the following regex: \mk_const\([\n\s]*(ty::)?ConstKind\
I've left `ty::ConstKind::{Bound, Error}` as-is, they seem clearer this
way.
 2022-11-28 17:27:20 +00:00
Maybe Waffle
1d42936b18 Prefer doc comments over //-comments in compiler 2022-11-27 11:19:04 +00:00
Matthias Krüger
5197ef66b7
Rollup merge of #103908 - estebank:consider-cloning, r=compiler-errors 
Suggest `.clone()` or `ref binding` on E0382
 2022-11-24 08:42:33 +01:00
bors
872631d0f0 Auto merge of #104507 - WaffleLapkin:asderefsyou, r=wesleywiser 
Use `as_deref` in compiler (but only where it makes sense)

This simplifies some code :3

(there are some changes that are not exacly `as_deref`, but more like "clever `Option`/`Result` method use")
 2022-11-24 00:17:35 +00:00
b-naber
9061ffba8c use no type in ProjectionElem::Field for PlaceBuilder::UpVar 2022-11-23 21:25:27 +01:00
Esteban Küber
3a471b5fd8 Account for x @ y and suggest ref x @ ref y 2022-11-23 12:17:48 -08:00
b-naber
c39de61d2a include closures and generators in try_compute_field_ty 2022-11-23 20:55:17 +01:00
b-naber
4040734e44 get field ty during projecting 2022-11-23 20:55:15 +01:00
b-naber
fd6fed3027 address review 2022-11-23 20:01:53 +01:00
b-naber
f015842ed2 properly handle enum field projections 2022-11-23 20:01:11 +01:00
b-naber
4d3a91b12b use non-ascribed type as field type in mir 2022-11-23 19:59:00 +01:00
b-naber
ac31d52324 implement PlaceBuilder::try_ty 2022-11-23 19:58:56 +01:00
bors
80b3c6dbde Auto merge of #103947 - camsteffen:place-clones, r=cjgillot 
Reduce `PlaceBuilder` cloning

Some API tweaks with an eye towards reducing clones.
 2022-11-23 13:13:50 +00:00
bors
66ccf36f16 Auto merge of #104711 - Dylan-DPC:rollup-gkw1qr8, r=Dylan-DPC 
Rollup of 6 pull requests

Successful merges:

 - #104295 (Check generics parity before collecting return-position `impl Trait`s in trait)
 - #104464 (Reduce exceptions overallocation on non Windows x86_64)
 - #104615 (Create def_id for async fns during lowering)
 - #104669 (Only declare bindings for if-let guards once per arm)
 - #104701 (Remove a lifetime resolution hack from `compare_predicate_entailment`)
 - #104710 (disable strict-provenance-violating doctests in Miri)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
 2022-11-22 13:18:45 +00:00
Dylan DPC
d29491aba0
Rollup merge of #104669 - LeSeulArtichaut:88015-if-let-guard-bindings, r=cjgillot 
Only declare bindings for if-let guards once per arm

Currently, each candidate for a match arm uses separate locals for the bindings in the if-let guard, causing problems (#88015) when those branches converge in the arm body.

Fixes #88015 (🤞)
 2022-11-22 16:36:38 +05:30
bors
b7463e8bdb Auto merge of #103578 - petrochenkov:nofict, r=nagisa 
Unreserve braced enum variants in value namespace

With this PR braced enum variants (`enum E { V { /*...*/ } }`) no longer take a slot in value namespace, so the special case mentioned in the note in https://github.com/rust-lang/rfcs/blob/master/text/1506-adt-kinds.md#braced-structs is removed.

Report - https://github.com/rust-lang/rust/pull/103578#issuecomment-1292594900.
 2022-11-22 10:17:09 +00:00
Oli Scherer
c2ecd8f1f6 merge self type and substs in trait_method 2022-11-21 20:41:17 +00:00
Oli Scherer
7658e0fccf Stop passing the self-type as a separate argument. 2022-11-21 20:39:46 +00:00
Oli Scherer
4d9451b1d1 Fix an ICE that I just made worse 2022-11-21 20:36:15 +00:00
Oli Scherer
25c4760b5d Some cleanup around trait_method lookup 2022-11-21 20:34:56 +00:00
Oli Scherer
9e4c3f41c1 Use iterators instead of slices at more sites 2022-11-21 20:34:28 +00:00
Oli Scherer
ec8d01fdcc Allow iterators instead of requiring slices that will get turned into iterators 2022-11-21 20:33:55 +00:00
Oli Scherer
6f77c97b38 Assert that various types have the right amount of generic args and fix the sites that used the wrong amount 2022-11-21 20:31:59 +00:00
Oli Scherer
0c47deed9f Reduce the amount of passed-around arguments that will get merged into one later anyway 2022-11-21 20:28:48 +00:00
Vadim Petrochenkov
7a5376d23c Unreserve braced enum variants in value namespace 2022-11-21 22:40:06 +03:00
Léo Lanteri Thauvin
baa59d1a77 Only declare bindings for if-let guards once per arm 2022-11-21 12:45:29 +01:00
Cameron Steffen
cc8dddbac9 Factor out conservative_is_privately_uninhabited 2022-11-20 19:04:11 -06:00
Cameron Steffen
34cbe72780 Change to Ty::is_inhabited_from 2022-11-20 19:04:11 -06:00
Matthias Krüger
820a41580e
Rollup merge of #104564 - RalfJung:either, r=oli-obk 
interpret: use Either over Result when it is not representing an error condition

r? `@oli-obk`
 2022-11-20 18:21:48 +01:00
Ralf Jung
09a887cebf review feedback 2022-11-18 14:24:48 +01:00
Ralf Jung
4101889786 interpret: use Either over Result when it is not representing an error condition 2022-11-18 10:18:32 +01:00
Deadbeef
bc51f8783c rename to string_deref_patterns 2022-11-18 06:16:20 +00:00
Cameron Steffen
9cf6ce070d Remove more PlaceBuilder clones 2022-11-17 19:01:05 -06:00
Cameron Steffen
105abe39c0 Replace into_place with to_place 2022-11-17 19:01:05 -06:00
Cameron Steffen
be5b7778c8 Replace try_upvars_resolved with try_to_place 2022-11-17 19:01:05 -06:00
Cameron Steffen
1c819792a7 Introduce PlaceBuilder::resolve_upvar by ref 2022-11-17 19:01:05 -06:00
Deadbeef
b2cb42d6a7 Minimal implementation of implicit deref patterns 2022-11-17 12:46:43 +00:00
bors
7c75fe4c85 Auto merge of #104170 - cjgillot:hir-def-id, r=fee1-dead 
Record `LocalDefId` in HIR nodes instead of a side table

This is part of an attempt to remove the `HirId -> LocalDefId` table from HIR.
This attempt is a prerequisite to creation of `LocalDefId` after HIR lowering (https://github.com/rust-lang/rust/pull/96840), by controlling how `def_id` information is accessed.

This first part adds the information to HIR nodes themselves instead of a table.
The second part is https://github.com/rust-lang/rust/pull/103902
The third part will be to make `hir::Visitor::visit_fn` take a `LocalDefId` as last parameter.
The fourth part will be to completely remove the side table.
 2022-11-17 07:42:27 +00:00
Maybe Waffle
94470f4efd Use as_deref in compiler (but only where it makes sense) 2022-11-16 21:58:58 +00:00
Matthias Krüger
5763fa74f0
Rollup merge of #104349 - rustaceanclub:master, r=oli-obk 
fix some typos in comments
 2022-11-14 19:26:18 +01:00
Camille GILLOT
607d0c2a14 Store a LocalDefId in hir::AnonConst. 2022-11-13 14:06:11 +00:00
Camille GILLOT
18482f7b23 Store a LocalDefId in hir::GenericParam. 2022-11-13 14:05:30 +00:00
cui fliter
442f848d74 fix some typos in comments 
Signed-off-by: cui fliter <imcusg@gmail.com>
 2022-11-13 15:26:17 +08:00
Michael Goulet
93921dd16d Don't ICE with inline const errors during MIR build 2022-11-11 17:21:58 +00:00
Michael Goulet
0f89fb1791 Use const_error_with_guaranteed more 2022-11-10 05:39:15 +00:00
Jakob Degen
ba359d8a51 Add support for custom MIR parsing 2022-11-08 23:13:15 -08:00
Matthias Krüger
b101f3a865
Rollup merge of #103984 - V0ldek:103974-refactor-mk_const, r=BoxyUwU 
Refactor tcx mk_const parameters.

Unroll the `ty::ConstS` parameter to `TyCtxt::mk_const` into separate `ty::ConstKind` and `Ty` parameters.

Signature change is in:

c97fd8183a/compiler/rustc_middle/src/ty/context.rs (L2234)

and

c97fd8183a/compiler/rustc_middle/src/ty/context.rs (L2572-L2575)

the rest is callsites.

Closes #103974

r? `@oli-obk`
 2022-11-05 00:02:06 +01:00
Mateusz
c97fd8183a
Refactor tcx mk_const parameters. 2022-11-04 20:33:32 +00:00
Cameron Steffen
e7bae89a3c Cleanup bind_pattern args 2022-11-03 19:33:59 -05:00
Dylan DPC
94241e7eaf
Rollup merge of #103584 - ouz-a:issue-102303, r=oli-obk 
Remove bounds check when array is indexed by enum

As the title says, this reverts the behavior introduced with 1.64.

Fixes #102303

r? `@oli-obk`
 2022-11-01 14:12:25 +05:30
Yuki Okushi
2a6a8f4d30
Rollup merge of #103749 - est31:reduce_irrefutable_let_else_span, r=cjgillot 
Reduce span of let else irrefutable_let_patterns warning

Huge spans aren't good for IDE users as they underline constructs that are possibly multiline.

Similar PR to #90761 which did the same for the `unused_macros` lint.
 2022-11-01 12:03:41 +09:00
ouz-a
a1672ad5b8 Remove bounds check with enum cast 2022-10-31 14:10:37 +03:00
est31
7b55d17a2f Reduce span of let else irrefutable_let_patterns warning 
Huge spans aren't good for IDE users as they underline constructs that
are possibly multiline.
 2022-10-30 05:05:21 +01:00
Matthias Krüger
2bff9e2193
Rollup merge of #103726 - TaKO8Ki:avoid-&str-to-string-conversions, r=compiler-errors 
Avoid unnecessary `&str` to `String` conversions
 2022-10-30 00:09:26 +02:00
Takayuki Maeda
a3a3f4d840 avoid unnecessary &str to String conversions 2022-10-29 17:14:44 +09:00
Maybe Waffle
a17ccfa621 Accept TyCtxt instead of TyCtxtAt in Ty::is_* functions 
Functions in answer:

- `Ty::is_freeze`
- `Ty::is_sized`
- `Ty::is_unpin`
- `Ty::is_copy_modulo_regions`
 2022-10-27 15:06:08 +04:00
Michael Goulet
6e6fe30d0f Comment why normalization is needed for debug assertions 2022-10-23 17:23:35 +00:00
Cameron Steffen
2928e9ef2c Introduce InhabitedPredicate 2022-10-22 13:20:06 -05:00
bors
b15e2c129e Auto merge of #101832 - compiler-errors:dyn-star-plus, r=eholk 
Make `dyn*` casts into a coercion, allow `dyn*` upcasting

I know that `dyn*` is likely not going to be a feature exposed to surface Rust, but this makes it slightly more ergonomic to write tests for these types anyways. ... and this was just fun to implement anyways.

1. Make `dyn*` into a coercion instead of a cast
2. Enable `dyn*` upcasting since we basically get it for free
3. Simplify some of the cast checking code since we're using the coercion path now

r? `@eholk` but feel free to reassign
cc `@nikomatsakis` and `@tmandry` who might care about making `dyn*` casts into a coercion
 2022-10-15 07:36:38 +00:00
Dylan DPC
7cf09c57a2
Rollup merge of #103031 - est31:match_guard_irrefutable_let, r=oli-obk 
Suppress irrefutable let patterns lint for prefixes in match guards

In match guards, irrefutable prefixes might use the bindings created by the match pattern. Ideally, we check for this, but we can do the next best thing and just not lint for irrefutable prefixes in match guards.

Fixes #98361
 2022-10-14 16:19:16 +05:30
Dylan DPC
77064b7f0a
Rollup merge of #103018 - Rageking8:more-dupe-word-typos, r=TaKO8Ki 
More dupe word typos

I only picked those changes (from the regex search) that I am pretty certain doesn't change meaning and is just a typo fix. Do correct me if any fix is undesirable and I can revert those. Thanks.
 2022-10-14 16:19:15 +05:30
Rageking8
7122abaddf more dupe word typos 2022-10-14 12:57:56 +08:00
Michael Goulet
76386bd65e Make dyn* cast into a coercion 2022-10-14 04:27:01 +00:00
est31
eab41a136a Suppress irrefutable let patterns lint for prefixes in match guards 
In match guards, irrefutable prefixes might use the bindings created
by the match pattern. Ideally, we check for this, but we can do the
next best thing and just not lint for irrefutable prefixes in match
guards.
 2022-10-14 02:16:40 +02:00
Gary Guo
de0396c718 Ensure enum cast moves 2022-10-13 16:44:47 +01:00
Dylan DPC
5a09b72156
Rollup merge of #102853 - cjgillot:skip-opaque-cast, r=jackh726 
Skip chained OpaqueCast when building captures.

Fixes https://github.com/rust-lang/rust/issues/102089
 2022-10-10 13:43:42 +05:30
Camille GILLOT
e828ce53b9 Skip chained OpaqueCast when building captures. 2022-10-09 16:18:16 +00:00
Eric Huss
be1c7aad72 Show let-else suggestion on stable. 2022-10-08 14:39:25 -07:00
Matthias Krüger
c731646d6a
Rollup merge of #102675 - ouz-a:mir-technical-debt, r=oli-obk 
Remove `mir::CastKind::Misc`

As discussed in #97649 `mir::CastKind::Misc` is not clear, this PR addresses that by creating a new enum variant for every valid cast.

r? ````@oli-obk````
 2022-10-08 14:38:18 +02:00
Cameron Steffen
283abbf0e7 Change InferCtxtBuilder from enter to build 2022-10-07 07:10:40 -05:00
Cameron Steffen
349415d1c6 Remove TypeckResults from InferCtxt 2022-10-07 07:06:19 -05:00
ouz-a
d59c7ff000 Remove mir::CastKind::Misc 2022-10-06 15:32:41 +03:00
bors
0152393048 Auto merge of #99324 - reez12g:issue-99144, r=jyn514 
Enable doctests in compiler/ crates

Helps with https://github.com/rust-lang/rust/issues/99144
 2022-10-06 03:01:57 +00:00
bors
c97d02cdb5 Auto merge of #102394 - dingxiangfei2009:issue-102317, r=oli-obk 
Fix unwind drop glue for if-then scopes

cc `@est31`

Fix #102317
Fix #99852

This PR fixes the drop glue for unwinding from a panic originated in a drop while breaking out for the else block in an `if-then` scope.
MIR validation does not fail for the synchronous versions of the test program, because `StorageDead` statements are skipped over in the unwinding process. It is only becoming a problem when it is inside a generator where `StorageDead` must be kept around.
 2022-10-05 20:47:39 +00:00
Ding Xiang Fei
565c35aa5c
fix doc and dedup diverge_cleanup 2022-10-05 22:24:12 +08:00
bors
744e397d88 Auto merge of #101986 - WaffleLapkin:move_lint_note_to_the_bottom, r=estebank 
Move lint level source explanation to the bottom

So, uhhhhh

r? `@estebank`

## User-facing change

"note: `#[warn(...)]` on by default" and such are moved to the bottom of the diagnostic:
```diff
-   = note: `#[warn(unsupported_calling_conventions)]` on by default
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
   = note: for more information, see issue #87678 <https://github.com/rust-lang/rust/issues/87678>
+   = note: `#[warn(unsupported_calling_conventions)]` on by default
```

Why warning is enabled is the least important thing, so it shouldn't be the first note the user reads, IMO.

## Developer-facing change

`struct_span_lint` and similar methods have a different signature.

Before: `..., impl for<'a> FnOnce(LintDiagnosticBuilder<'a, ()>)`
After: `..., impl Into<DiagnosticMessage>, impl for<'a, 'b> FnOnce(&'b mut DiagnosticBuilder<'a, ()>) -> &'b mut DiagnosticBuilder<'a, ()>`

The reason for this is that `struct_span_lint` needs to edit the diagnostic _after_ `decorate` closure is called. This also makes lint code a little bit nicer in my opinion.

Another option is to use `impl for<'a> FnOnce(LintDiagnosticBuilder<'a, ()>) -> DiagnosticBuilder<'a, ()>` altough I don't _really_ see reasons to do `let lint = lint.build(message)` everywhere.

## Subtle problem

By moving the message outside of the closure (that may not be called if the lint is disabled) `format!(...)` is executed earlier, possibly formatting `Ty` which may call a query that trims paths that crashes the compiler if there were no warnings...

I don't think it's that big of a deal, considering that we move from `format!(...)` to `fluent` (which is lazy by-default) anyway, however this required adding a workaround which is unfortunate.

## P.S.

I'm sorry, I do not how to make this PR smaller/easier to review. Changes to the lint API affect SO MUCH 😢
 2022-10-01 10:44:25 +00:00
Maybe Waffle
a8f7e244b7 Refactor rustc lint API 2022-10-01 10:03:06 +00:00
X
fb52dc7c3b
apply suggestion 
Co-authored-by: SafariMonkey <charlton.rodda@gmail.com>
 2022-09-30 21:03:08 +08:00
bors
1bb8d276c9 Auto merge of #101887 - nnethercote:shrink-Res, r=spastorino 
Shrink `hir::def::Res`

r? `@spastorino`
 2022-09-29 22:45:24 +00:00
Oli Scherer
f22f149dbd Some path updates 2022-09-29 09:33:30 +00:00
reez12g
9a4c5abe45 Remove from compiler/ crates 2022-09-29 16:49:04 +09:00
Nicholas Nethercote
f07d4efc45 Shrink hir::def::Res. 
`Res::SelfTy` currently has two `Option`s. When the second one is `Some`
the first one is never consulted. So we can split it into two variants,
`Res::SelfTyParam` and `Res::SelfTyAlias`, reducing the size of `Res`
from 24 bytes to 12. This then shrinks `hir::Path` and
`hir::PathSegment`, which are the HIR types that take up the most space.
 2022-09-29 08:44:52 +10:00
Ding Xiang Fei
4a2c1a12b6
fix unwind drop glue for if-then scopes 2022-09-28 18:45:11 +08:00
lcnr
1fc86a63f4 rustc_typeck to rustc_hir_analysis 2022-09-27 10:37:23 +02:00
bors
1d1f142660 Auto merge of #102257 - cjgillot:let-else-lint, r=dingxiangfei2009 
Fix lint scoping for let-else.

The scoping for let-else is inconsistent with HIR nesting.  This creates cases, in `ui/let-else/let-else-allow-unused.rs` for instance, where an `allow` lint attribute does not apply to the bindings created by `let-else`.

This PR is an attempt to correct this.

As there is no lint that currently relies on this, the test for this behaviour is https://github.com/rust-lang/rust/pull/101500.

cc `@dingxiangfei2009` as you filed https://github.com/rust-lang/rust/pull/101894
 2022-09-26 17:17:07 +00:00
Pietro Albini
3975d55d98
remove cfg(bootstrap) 2022-09-26 10:14:45 +02:00
Camille GILLOT
73c52bc4dc Fix scoping for let-else. 2022-09-25 11:30:49 +02:00
b-naber
a705e65605 rename Unevaluated to UnevaluatedConst 2022-09-23 14:27:34 +02:00
b-naber
9f3784df89 introduce mir::Unevaluated 2022-09-22 12:35:28 +02:00
Michael Howell
b149c48186
Rollup merge of #102021 - lcnr:tyConst-fun, r=b-naber,BoxyUwU 
some post-valtree cleanup

r? project-const-generics cc ```@b-naber```
 2022-09-20 10:13:01 -07:00
bors
4136b59b7d Auto merge of #99806 - oli-obk:unconstrained_opaque_type, r=estebank 
Allow patterns to constrain the hidden type of opaque types

fixes #96572

reverts a revert as original PR was a perf regression that was fixed by reverting it: https://github.com/rust-lang/rust/pull/99368#issuecomment-1186587864)

TODO:

* check if https://github.com/rust-lang/rust/issues/99685 is avoided
 2022-09-20 12:09:52 +00:00
bors
2019147c56 Auto merge of #101894 - dingxiangfei2009:let-else-avoid-duplicate-storage-live, r=oli-obk 
Avoid duplicating StorageLive in let-else

cc `@est31`

Fix #101867
Fix #101932

#101410 introduced directives to activate storages of bindings in let-else earlier. However, since it is using the machinery of `match` and friends for pattern matching and binding, those storages are activated for the second time. This PR adjusts this behavior and avoid the duplicated activation for let-else statements.
 2022-09-19 17:27:30 +00:00
Oli Scherer
1905f8c441 Document projection condition 2022-09-19 15:33:36 +00:00
lcnr
526856768d ctfe, const_to_op only for mir constants 2022-09-19 16:17:33 +02:00
lcnr
647052fc04 remove the Subst trait, always use EarlyBinder 2022-09-19 11:37:27 +02:00
Ding Xiang Fei
48c1c1d190
avoid duplicating StorageLive in let-else 2022-09-18 12:10:53 +08:00
Dylan DPC
3ad81e0dd8
Rollup merge of #93628 - est31:stabilize_let_else, r=joshtriplett 
Stabilize `let else`

🎉  **Stabilizes the `let else` feature, added by [RFC 3137](https://github.com/rust-lang/rfcs/pull/3137).** 🎉

Reference PR: https://github.com/rust-lang/reference/pull/1156

closes #87335 (`let else` tracking issue)

FCP: https://github.com/rust-lang/rust/pull/93628#issuecomment-1029383585

----------

## Stabilization report

### Summary

The feature allows refutable patterns in `let` statements if the expression is
followed by a diverging `else`:

```Rust
fn get_count_item(s: &str) -> (u64, &str) {
    let mut it = s.split(' ');
    let (Some(count_str), Some(item)) = (it.next(), it.next()) else {
        panic!("Can't segment count item pair: '{s}'");
    };
    let Ok(count) = u64::from_str(count_str) else {
        panic!("Can't parse integer: '{count_str}'");
    };
    (count, item)
}
assert_eq!(get_count_item("3 chairs"), (3, "chairs"));
```

### Differences from the RFC / Desugaring

Outside of desugaring I'm not aware of any differences between the implementation and the RFC. The chosen desugaring has been changed from the RFC's [original](https://rust-lang.github.io/rfcs/3137-let-else.html#reference-level-explanations). You can read a detailed discussion of the implementation history of it in `@cormacrelf` 's [summary](https://github.com/rust-lang/rust/pull/93628#issuecomment-1041143670) in this thread, as well as the [followup](https://github.com/rust-lang/rust/pull/93628#issuecomment-1046598419). Since that followup, further changes have happened to the desugaring, in #98574, #99518, #99954. The later changes were mostly about the drop order: On match, temporaries drop in the same order as they would for a `let` declaration. On mismatch, temporaries drop before the `else` block.

### Test cases

In chronological order as they were merged.

Added by df9a2e0687 (#87688):

* [`ui/pattern/usefulness/top-level-alternation.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/pattern/usefulness/top-level-alternation.rs) to ensure the unreachable pattern lint visits patterns inside `let else`.

Added by 5b95df4bdc (#87688):

* [`ui/let-else/let-else-bool-binop-init.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-bool-binop-init.rs) to ensure that no lazy boolean expressions (using `&&` or `||`) are allowed in the expression, as the RFC mandates.
* [`ui/let-else/let-else-brace-before-else.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-brace-before-else.rs) to ensure that no `}` directly preceding the `else` is allowed in the expression, as the RFC mandates.
* [`ui/let-else/let-else-check.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-check.rs) to ensure that `#[allow(...)]` attributes added to the entire `let` statement apply for the `else` block.
* [`ui/let-else/let-else-irrefutable.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-irrefutable.rs) to ensure that the `irrefutable_let_patterns` lint fires.
* [`ui/let-else/let-else-missing-semicolon.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-missing-semicolon.rs) to ensure the presence of semicolons at the end of the `let` statement.
* [`ui/let-else/let-else-non-diverging.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-non-diverging.rs) to ensure the `else` block diverges.
* [`ui/let-else/let-else-run-pass.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-run-pass.rs) to ensure the feature works in some simple test case settings.
* [`ui/let-else/let-else-scope.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-scope.rs) to ensure the bindings created by the outer `let` expression are not available in the `else` block of it.

Added by bf7c32a447 (#89965):

* [`ui/let-else/issue-89960.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/issue-89960.rs) as a regression test for the ICE-on-error bug #89960 . Later in 102b9125e1 this got removed in favour of more comprehensive tests.

Added by 856541963c (#89974):

* [`ui/let-else/let-else-if.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-if.rs) to test for the improved error message that points out that `let else if` is not possible.

Added by 9b45713b6c:

* [`ui/let-else/let-else-allow-unused.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-allow-unused.rs) as a regression test for #89807, to ensure that `#[allow(...)]` attributes added to the entire `let` statement apply for bindings created by the `let else` pattern.

Added by 61bcd8d307 (#89841):

* [`ui/let-else/let-else-non-copy.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-non-copy.rs) to ensure that a copy is performed out of non-copy wrapper types. This mirrors `if let` behaviour. The test case bases on rustc internal changes originally meant for #89933 but then removed from the PR due to the error prior to the improvements of #89841.
* [`ui/let-else/let-else-source-expr-nomove-pass.rs `](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-source-expr-nomove-pass.rs) to ensure that while there is a move of the binding in the successful case, the `else` case can still access the non-matching value. This mirrors `if let` behaviour.

Added by 102b9125e1 (#89841):

* [`ui/let-else/let-else-ref-bindings.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-ref-bindings.rs) and [`ui/let-else/let-else-ref-bindings-pass.rs `](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-ref-bindings-pass.rs) to check `ref` and `ref mut` keywords in the pattern work correctly and error when needed.

Added by 2715c5f984 (#89841):

* Match ergonomic tests adapted from the `rfc2005` test suite.

Added by fec8a507a2 (#89841):

* [`ui/let-else/let-else-deref-coercion-annotated.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-deref-coercion-annotated.rs) and [`ui/let-else/let-else-deref-coercion.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-deref-coercion.rs) to check deref coercions.

#### Added since this stabilization report was originally written (2022-02-09)

Added by 76ea566677 (#94211):

* [`ui/let-else/let-else-destructuring.rs`](https://github.com/rust-lang/rust/blob/1.63.0/src/test/ui/let-else/let-else-destructuring.rs) to give a nice error message if an user tries to do an assignment with a (possibly refutable) pattern and an `else` block, like asked for in #93995.

Added by e7730dcb7e (#94208):

* [`ui/let-else/let-else-allow-in-expr.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-allow-in-expr.rs) to test whether `#[allow(unused_variables)]` works in the expr, as well as its non presence, as well as putting it on the entire `let else` *affects* the expr, too. This was adding a missing test as pointed out by the stabilization report.
* Expansion of `ui/let-else/let-else-allow-unused.rs` and `ui/let-else/let-else-check.rs` to ensure that non-presence of `#[allow(unused)]` does issue the unused lint. This was adding a missing test case as pointed out by the stabilization report.

Added by 5bd71063b3 (#94208):

* [`ui/let-else/let-else-slicing-error.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-slicing-error.rs), a regression test for #92069, which got fixed without addition of a regression test. This resolves a missing test as pointed out by the stabilization report.

Added by 5374688e1d (#98574):

* [`src/test/ui/async-await/async-await-let-else.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/async-await/async-await-let-else.rs) to test the interaction of async/await with `let else`

Added by 6c529ded86 (#98574):

* [`src/test/ui/let-else/let-else-temporary-lifetime.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs) as a (partial) regression test for #98672

Added by 9b56640106 (#99518):

* [`src/test/ui/let-else/let-else-temp-borrowck.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs) as a regression test for #93951
* Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a partial regression test for #98672 (especially regarding `else` drop order)

Added by baf9a7cb57 (#99518):

* Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a partial regression test for #93951, similar to `let-else-temp-borrowck.rs`

Added by 60be2de8b7 (#99518):

* Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a program that can now be compiled thanks to borrow checker implications of #99518

Added by 47a7a91c96 (#100132):

* [`src/test/ui/let-else/issue-100103.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-100103.rs), as a regression test for #100103, to ensure that there is no ICE when doing `Err(...)?` inside else blocks.

Added by e3c5bd617d (#100443):

* [`src/test/ui/let-else/let-else-then-diverge.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-then-diverge.rs), to verify that there is no unreachable code error with the current desugaring.

Added by 981852677c (#100443):

* [`src/test/ui/let-else/issue-94176.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-94176.rs), to make sure that a correct span is emitted for a missing trailing expression error. Regression test for #94176.

Added by e182d12a84 (#100434):

* [src/test/ui/unpretty/pretty-let-else.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/unpretty/pretty-let-else.rs), as a regression test to ensure pretty printing works for `let else` (this bug surfaced in many different ways)

Added by e26285603c (#99954):

* [`src/test/ui/let-else/let-else-temporary-lifetime.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs) extended to contain & borrows as well, as this was identified as an earlier issue with the desugaring: https://github.com/rust-lang/rust/issues/98672#issuecomment-1200196921

Added by 2d8460ef43 (#99291):

* [`src/test/ui/let-else/let-else-drop-order.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-drop-order.rs) a matrix based test for various drop order behaviour of `let else`. Especially, it verifies equality of `let` and `let else` drop orders, [resolving](https://github.com/rust-lang/rust/pull/93628#issuecomment-1238498468) a [stabilization blocker](https://github.com/rust-lang/rust/pull/93628#issuecomment-1055738523).

Added by 1b87ce0d40 (#101410):

* Edit to `src/test/ui/let-else/let-else-temporary-lifetime.rs` to add the `-Zvalidate-mir` flag, as a regression test for #99228

Added by af591ebe4d (#101410):

* [`src/test/ui/let-else/issue-99975.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-99975.rs) as a regression test for the ICE #99975.

Added by this PR:

* `ui/let-else/let-else.rs`, a simple run-pass check, similar to `ui/let-else/let-else-run-pass.rs`.

### Things not currently tested

* ~~The `#[allow(...)]` tests check whether allow works, but they don't check whether the non-presence of allow causes a lint to fire.~~ → *test added by e7730dcb7eb29a10ee73f269f4dc6e9d606db0da*
* ~~There is no `#[allow(...)]` test for the expression, as there are tests for the pattern and the else block.~~ → *test added by e7730dcb7eb29a10ee73f269f4dc6e9d606db0da*
* ~~`let-else-brace-before-else.rs` forbids the `let ... = {} else {}` pattern and there is a rustfix to obtain `let ... = ({}) else {}`. I'm not sure whether the `.fixed` files are checked by the tooling that they compile. But if there is no such check, it would be neat to make sure that `let ... = ({}) else {}` compiles.~~ → *test added by e7730dcb7eb29a10ee73f269f4dc6e9d606db0da*
* ~~#92069 got closed as fixed, but no regression test was added. Not sure it's worth to add one.~~ → *test added by 5bd71063b3810d977aa376d1e6dd7cec359330cc*
* ~~consistency between `let else` and `if let` regarding lifetimes and drop order: https://github.com/rust-lang/rust/pull/93628#issuecomment-1055738523~~ → *test added by 2d8460ef43d902f34ba2133fe38f66ee8d2fdafc*

Edit: they are all tested now.

### Possible future work / Refutable destructuring assignments

[RFC 2909](https://rust-lang.github.io/rfcs/2909-destructuring-assignment.html) specifies destructuring assignment, allowing statements like `FooBar { a, b, c } = foo();`.
As it was stabilized, destructuring assignment only allows *irrefutable* patterns, which before the advent of `let else` were the only patterns that `let` supported.
So the combination of `let else` and destructuring assignments gives reason to think about extensions of the destructuring assignments feature that allow refutable patterns, discussed in #93995.

A naive mapping of `let else` to destructuring assignments in the form of `Some(v) = foo() else { ... };` might not be the ideal way. `let else` needs a diverging `else` clause as it introduces new bindings, while assignments have a default behaviour to fall back to if the pattern does not match, in the form of not performing the assignment. Thus, there is no good case to require divergence, or even an `else` clause at all, beyond the need for having *some* introducer syntax so that it is clear to readers that the assignment is not a given (enums and structs look similar). There are better candidates for introducer syntax however than an empty `else {}` clause, like `maybe` which could be added as a keyword on an edition boundary:

```Rust
let mut v = 0;
maybe Some(v) = foo(&v);
maybe Some(v) = foo(&v) else { bar() };
```

Further design discussion is left to an RFC, or the linked issue.
 2022-09-17 15:31:06 +05:30
bors
c524c7dd25 Auto merge of #98588 - b-naber:valtrees-cleanup, r=lcnr 
Use only ty::Unevaluated<'tcx, ()> in type system

r? `@lcnr`
 2022-09-17 03:04:22 +00:00
Oli Scherer
dab1074b91 Only generate OpaqueCast for opaque types 2022-09-16 11:37:50 +00:00
Oli Scherer
40e2de8c41 Revert "Revert "Rollup merge of #98582 - oli-obk:unconstrained_opaque_type, r=estebank"" 
This reverts commit 4a742a691e.
 2022-09-16 11:36:39 +00:00
Oli Scherer
5d664f7a8f Merge two arguments into one 2022-09-16 11:36:09 +00:00
est31
173eb6f407 Only enable the let_else feature on bootstrap 
On later stages, the feature is already stable.

Result of running:

rg -l "feature.let_else" compiler/ src/librustdoc/ library/ | xargs sed -s -i "s#\\[feature.let_else#\\[cfg_attr\\(bootstrap, feature\\(let_else\\)#"
 2022-09-15 21:06:45 +02:00
est31
5633e863bd Remove feature gate from let else suggestion 
The let else suggestion added by 0d92752b8a
does not need a feature gate any more.
 2022-09-15 21:06:45 +02:00
Ding Xiang Fei
4a5d2a561c
add diagram to explain the MIR structure 2022-09-15 10:08:14 +08:00
Ding Xiang Fei
c7d1c9b66f
add explanatory note 2022-09-15 10:08:13 +08:00
Ding Xiang Fei
34f0c4502f
supplement for the missing or incomplete comments 2022-09-15 10:08:11 +08:00
Ding Xiang Fei
1b87ce0d40
reorder nesting scopes and declare bindings without drop schedule 2022-09-15 10:07:54 +08:00
bors
6153d3cbe6 Auto merge of #101212 - eholk:dyn-star, r=compiler-errors 
Initial implementation of dyn*

This PR adds extremely basic and incomplete support for [dyn*](https://smallcultfollowing.com/babysteps//blog/2022/03/29/dyn-can-we-make-dyn-sized/). The goal is to get something in tree behind a flag to make collaboration easier, and also to make sure the implementation so far is not unreasonable. This PR does quite a few things:

* Introduce `dyn_star` feature flag
* Adds parsing for `dyn* Trait` types
* Defines `dyn* Trait` as a sized type
* Adds support for explicit casts, like `42usize as dyn* Debug`
  * Including const evaluation of such casts
* Adds codegen for drop glue so things are cleaned up properly when a `dyn* Trait` object goes out of scope
* Adds codegen for method calls, at least for methods that take `&self`

Quite a bit is still missing, but this gives us a starting point. Note that this is never intended to become stable surface syntax for Rust, but rather `dyn*` is planned to be used as an implementation detail for async functions in dyn traits.

Joint work with `@nikomatsakis` and `@compiler-errors.`

r? `@bjorn3`
 2022-09-14 18:10:51 +00:00
b-naber
6af8fb7936 address review again 2022-09-14 17:30:25 +02:00
Camille GILLOT
f3a37ed574 Shrink some visibilities. 2022-09-13 19:18:24 +02:00
Camille GILLOT
af128b0144 Also compute implicit params in THIR. 2022-09-13 19:18:24 +02:00
Camille GILLOT
445841cda3 Compute explicit MIR params on THIR. 2022-09-13 19:18:23 +02:00
Camille GILLOT
f76594a0bc Simplify MIR building entry. 2022-09-13 19:18:23 +02:00
Camille GILLOT
1f370d9437 Use tcx.hir() utils for spans in MIR building. 
This corrects the `span_with_body` in the case of closures, which was
incorrectly shortened to the `def_span`.
 2022-09-13 19:18:23 +02:00
Camille GILLOT
ffe20d61d6 Only keep one version of ImplicitSelfKind. 2022-09-13 19:18:23 +02:00
b-naber
a4bbb8db5c use ty::Unevaluated<'tcx, ()> in type system 2022-09-13 17:40:59 +02:00
Eric Holk
c5441acf67 Call destructors when dyn* object goes out of scope 2022-09-12 16:55:57 -07:00
Eric Holk
549c105bb3 dyn* through more typechecking and MIR 2022-09-12 16:55:56 -07:00
bors
2e44c17c12 Auto merge of #100968 - cjgillot:mir-upvar-vec, r=wesleywiser 
Only compute captures once when building MIR.
 2022-09-10 12:07:29 +00:00
Camille Gillot
bcbd183ca3
Remove unused temp. 
Co-authored-by: Wesley Wiser <wwiser@gmail.com>
 2022-09-10 12:10:04 +02:00
bors
24d6992020 Auto merge of #101467 - nnethercote:shrink-hir-Ty-Pat, r=spastorino 
Shrink `hir::Ty` and `hir::Pat`

r? `@ghost`
 2022-09-08 13:11:57 +00:00
Dylan DPC
0d61a507f5
Rollup merge of #101399 - cjgillot:borrowck-binding-span, r=estebank 
Shrink span for bindings with subpatterns.

Bindings with nested patterns (`binding @ pat` syntax) currently point to the full pattern.  This PR proposes to shrink the span to stop before the ````@`.```  This makes the diagnostics for move/mutability conflicts clearer, as they not point to the `binding` only, instead of the full pat.

r? ```@estebank```
 2022-09-08 11:55:06 +05:30
Nicholas Nethercote
e67f39f8bc Introduce DotDotPos. 
This shrinks `hir::Pat` from 88 to 72 bytes.
 2022-09-08 15:25:50 +10:00
Camille GILLOT
5d94d42485 Shrink span for bindings with subpatterns. 2022-09-06 20:57:44 +02:00
Guillaume Gomez
d13aefdc65
Rollup merge of #101357 - compiler-errors:variant-sugg-tweak, r=oli-obk 
Include enum path in variant suggestion

(except for `Result` and `Option`, which we should have via the prelude)

Fixes #101356
 2022-09-06 17:00:25 +02:00
Takayuki Maeda
fea1c5f5c8 refactor: remove unnecessary variables 2022-09-05 22:31:02 +09:00
Takayuki Maeda
87c6da363f separate the receiver from arguments in HIR 2022-09-05 22:25:49 +09:00
Michael Goulet
be53bd8380 Include enum path in variant suggestion 2022-09-03 08:11:17 +00:00
Nicholas Nethercote
43a0268f3a Use boxed slices in PatKind. 
To shrink it a little more.
 2022-09-02 07:26:22 +10:00
Nicholas Nethercote
a40124e01c Box CanonicalUserTypeAnnotation::CanonicalUserType. 
This shrinks `Ascription`, which shrinks `PatKind::AscribeUserType`,
which shrinks `Pat`.
 2022-09-02 07:26:22 +10:00
Nicholas Nethercote
2c4c8eb1a3 Box PatKind::Range. 
Because it's the biggest variant. Also, make `PatRange` non-`Copy`,
because it's 104 bytes, which is pretty big.
 2022-09-02 07:26:22 +10:00