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rust/tests/ui/closures
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bors ff6dc928c5 Auto merge of #142390 - cjgillot:mir-liveness, r=davidtwco 
Perform unused assignment and unused variables lints on MIR.

Rebase of https://github.com/rust-lang/rust/pull/101500

Fixes https://github.com/rust-lang/rust/issues/51003.

The first commit moves detection of uninhabited types from the current liveness pass to MIR building.

In order to keep the same level of diagnostics, I had to instrument MIR a little more:
- keep for which original local a guard local is created;
- store in the `VarBindingForm` the list of introducer places and whether this was a shorthand pattern.

I am not very proud of the handling of self-assignments. The proposed scheme is in two parts: first detect probable self-assignments, by pattern matching on MIR, and second treat them specially during dataflow analysis. I welcome ideas.

Please review carefully the changes in tests. There are many small changes to behaviour, and I'm not sure all of them are desirable.
2025-10-12 13:00:04 +00:00
..
2229_closure_analysis
Diagnose liveness on MIR.
2025-10-11 20:50:21 +00:00
binder
stabilize gai
2025-06-11 15:30:15 +01:00
closure-expected-type
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
deduce-signature
Fix; correct placement of type inference error for method calls
2025-10-07 09:51:16 +01:00
print
Do not gather local all together at the beginning of typeck
2025-05-05 14:27:09 +00:00
add_semicolon_non_block_closure.rs
Don't suggest adding return type for closures with default return type
2024-08-28 12:54:39 +08:00
add_semicolon_non_block_closure.stderr
Don't suggest adding return type for closures with default return type
2024-08-28 12:54:39 +08:00
aliasability-violation-with-closure-21600.rs
Rehome tests/ui/issues/ tests [3/?]
2025-08-04 16:43:53 -04:00
aliasability-violation-with-closure-21600.stderr
Rehome tests/ui/issues/ tests [3/?]
2025-08-04 16:43:53 -04:00
basic-closure-syntax.rs
cleaned up some tests
2025-06-30 11:50:19 +05:00
boxed-closure-lifetime-13808.rs
comments
2025-08-05 19:34:46 +05:00
cannot-call-unsized-via-ptr-2.rs
Always register sized obligation for argument
2023-06-15 03:18:21 +00:00
cannot-call-unsized-via-ptr-2.stderr
Always register sized obligation for argument
2023-06-15 03:18:21 +00:00
cannot-call-unsized-via-ptr.rs
Always register sized obligation for argument
2023-06-15 03:18:21 +00:00
cannot-call-unsized-via-ptr.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
capture-unsized-by-move.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
capture-unsized-by-move.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
capture-unsized-by-ref.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure_cap_coerce_many_fail.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure_cap_coerce_many_fail.stderr
adjust how closure/generator types and rvalues are printed
2023-09-21 22:20:58 +02:00
closure_no_cap_coerce_many_check_pass.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure_no_cap_coerce_many_run_pass.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure_no_cap_coerce_many_unsafe_0.rs
Remove revisions for THIR unsafeck
2024-01-05 09:30:27 +00:00
closure_no_cap_coerce_many_unsafe_0.stderr
Remove revisions for THIR unsafeck
2024-01-05 09:30:27 +00:00
closure_no_cap_coerce_many_unsafe_1.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure_promotion.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure-array-break-length.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-array-break-length.stderr
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-bounds-cant-promote-superkind-in-struct.rs
Continue compilation after check_mod_type_wf errors
2024-02-14 11:00:30 +00:00
closure-bounds-cant-promote-superkind-in-struct.stderr
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
closure-bounds-static-cant-capture-borrowed.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-bounds-static-cant-capture-borrowed.stderr
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-bounds-subtype.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-bounds-subtype.stderr
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
closure-capture-after-clone.rs
cleaned up some tests
2025-07-01 16:26:57 +05:00
closure-clone-requires-captured-clone.rs
cleaned up some tests
2025-07-01 15:16:56 +05:00
closure-clone-requires-captured-clone.stderr
cleaned up some tests
2025-07-01 15:16:56 +05:00
closure-expected.rs
Pretty print Fn traits in rustc_on_unimplemented
2023-11-02 20:57:05 +00:00
closure-expected.stderr
Use parenthetical notation for Fn traits
2024-05-29 22:26:54 +00:00
closure-immut-capture-error.rs
cleaned up some tests
2025-06-04 17:48:50 +05:00
closure-immut-capture-error.stderr
cleaned up some tests
2025-06-04 17:48:50 +05:00
closure-immutable-outer-variable.fixed
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure-immutable-outer-variable.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
closure-immutable-outer-variable.rs.fixed
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-immutable-outer-variable.stderr
More accurate mutability suggestion
2024-07-04 05:36:34 +00:00
closure-last-use-move.rs
cleaned up some tests
2025-07-01 16:26:57 +05:00
closure-move-sync.rs
update failing ui tests
2023-06-20 19:46:01 -04:00
closure-move-sync.stderr
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
closure-mut-argument-6153.rs
Add test batch 1
2025-08-27 00:23:26 -04:00
closure-no-copy-mut-env.rs
cleaned up some tests
2025-07-05 01:25:48 +05:00
closure-no-copy-mut-env.stderr
cleaned up some tests
2025-07-05 01:25:48 +05:00
closure-no-fn-1.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-no-fn-1.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
closure-no-fn-2.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-no-fn-2.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
closure-no-fn-3.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-no-fn-3.stderr
Note closure captures when reporting deferred cast to fn ptr failed
2024-07-22 21:51:44 -04:00
closure-no-fn-4.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-no-fn-4.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
closure-no-fn-5.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-no-fn-5.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
closure-referencing-itself-issue-25954.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-referencing-itself-issue-25954.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
closure-reform-bad.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-reform-bad.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
closure-return-type-mismatch.rs
Pass correct HirId to late_bound_vars in diagnostic code
2024-09-26 19:26:08 +02:00
closure-return-type-mismatch.stderr
Merge typeck loop with static/const item eval loop
2025-05-09 15:31:27 +00:00
closure-return-type-must-be-sized.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-return-type-must-be-sized.stderr
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
closure-type-inference-in-context-9129.rs
Rehome tests/ui/issues/ tests [4/?]
2025-08-10 11:54:15 -04:00
closure-upvar-last-use-analysis.rs
cleaned up some tests
2025-07-01 16:26:57 +05:00
closure-wrong-kind.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
closure-wrong-kind.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
coerce-unsafe-closure-to-unsafe-fn-ptr.rs
Remove revisions for THIR unsafeck
2024-01-05 09:30:27 +00:00
coerce-unsafe-closure-to-unsafe-fn-ptr.stderr
update ui tests
2024-01-07 08:56:20 -08:00
coerce-unsafe-to-closure.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
coerce-unsafe-to-closure.stderr
remove support for extern-block const intrinsics
2024-11-04 23:27:45 +01:00
correct-args-on-call-suggestion.rs
Fix closure arg extraction in extract_callable_info
2024-11-02 03:42:10 +00:00
correct-args-on-call-suggestion.stderr
Fix closure arg extraction in extract_callable_info
2024-11-02 03:42:10 +00:00
deduce-from-object-supertrait.rs
Do not deduplicate list of associated types provided by dyn principal
2025-02-21 19:32:45 +00:00
deeply-nested_closures.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
diverging-closure.rs
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
eager-mono-with-normalizable-upvars.rs
Normalize closure instance before eagerly monomorphizing it
2025-02-14 19:18:43 +00:00
fnonce-call-twice-error.rs
cleaned up some tests
2025-07-05 00:50:51 +05:00
fnonce-call-twice-error.stderr
cleaned up some tests
2025-07-05 00:50:51 +05:00
fnonce-moved-twice-12127.rs
comments
2025-07-31 21:25:49 +05:00
fnonce-moved-twice-12127.stderr
comments
2025-07-31 21:25:49 +05:00
generic-typed-nested-closures-59494.rs
Add test batch 3
2025-09-12 14:45:12 -04:00
generic-typed-nested-closures-59494.stderr
Add test batch 3
2025-09-12 14:45:12 -04:00
impl-closure-147146.rs
added error for closures case in impl
2025-10-01 12:38:16 +00:00
impl-closure-147146.stderr
added error for closures case in impl
2025-10-01 12:38:16 +00:00
issue-868.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
issue-1460.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
issue-1460.stderr
bless tests with new lint messages
2025-08-19 21:27:10 +02:00
issue-5239-1.rs
Move some tests
2024-04-21 15:43:43 -03:00
issue-5239-1.stderr
Move some tests
2024-04-21 15:43:43 -03:00
issue-5239-2.rs
Move some tests
2024-04-21 15:43:43 -03:00
issue-6801.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-6801.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-10398.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-10398.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-10682.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
issue-11873.rs
Move tests
2023-08-28 17:47:37 -03:00
issue-11873.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-22864-1.rs
Move some tests
2024-04-21 15:43:43 -03:00
issue-22864-2.rs
Move some tests
2024-04-21 15:43:43 -03:00
issue-25439.rs
s/generator/coroutine/
2023-10-20 21:14:01 +00:00
issue-25439.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-41366.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-42463.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-46742.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-48109.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-52437.rs
address review comments
2025-08-22 13:16:44 +08:00
issue-52437.stderr
address review comments
2025-08-22 13:16:44 +08:00
issue-67123.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-67123.stderr
reword trait bound suggestion message to include the bounds
2024-12-07 21:26:20 +00:00
issue-68025.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-72408-nested-closures-exponential.rs
Gate the type length limit check behind a nightly flag
2024-07-12 21:16:09 -04:00
issue-78720.rs
re-use sized fast path
2025-04-09 10:42:26 +00:00
issue-78720.stderr
fix: Add col separator before secondary messages with no source
2025-08-26 15:15:17 -06:00
issue-80313-mutable-borrow-in-closure.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-80313-mutable-borrow-in-closure.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-80313-mutable-borrow-in-move-closure.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-80313-mutable-borrow-in-move-closure.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-80313-mutation-in-closure.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-80313-mutation-in-closure.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-80313-mutation-in-move-closure.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-80313-mutation-in-move-closure.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-81700-mut-borrow.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-81700-mut-borrow.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-82438-mut-without-upvar.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-82438-mut-without-upvar.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-84044-drop-non-mut.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-84044-drop-non-mut.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-84128.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-84128.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-87461.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-87461.stderr
Emit a hint for bad call return types due to generic arguments
2023-01-13 13:34:55 +09:00
issue-87814-1.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-87814-2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-90871.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-90871.stderr
fix: Add col separator before secondary messages with no source
2025-08-26 15:15:17 -06:00
issue-97607.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-99565.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
issue-99565.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
issue-101696.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-102089-multiple-opaque-cast.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
issue-109188.rs
Continue to borrowck even if there were previous errors
2024-02-08 08:10:43 +00:00
issue-109188.stderr
Return equal for two identical projections
2023-03-21 15:28:11 +08:00
issue-111932.rs
diagnostics: do not suggest type name tweaks on type-inferred closure args
2023-06-05 19:05:15 -07:00
issue-111932.stderr
Implement DesugaringKind::FormatLiteral
2025-06-22 10:58:25 +02:00
issue-113087.rs
don't suggest move for borrows that aren't closures
2023-06-28 23:56:58 +02:00
issue-113087.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
labeled-break-inside-closure-62480.rs
Add test batch 4
2025-10-11 21:59:51 -04:00
labeled-break-inside-closure-62480.stderr
Add test batch 4
2025-10-11 21:59:51 -04:00
local-type-mix.rs
Stabilize async closures
2024-12-13 00:04:56 +00:00
local-type-mix.stderr
Stabilize async closures
2024-12-13 00:04:56 +00:00
many-closures.rs
cleaned up some tests
2025-07-01 15:29:29 +05:00
missing-body.rs
Replace ItemCtxt::report_placeholder_type_error match with a call to TyCtxt::def_descr
2025-06-30 20:36:16 +02:00
missing-body.stderr
Replace ItemCtxt::report_placeholder_type_error match with a call to TyCtxt::def_descr
2025-06-30 20:36:16 +02:00
moved-upvar-mut-rebind-11958.rs
Diagnose liveness on MIR.
2025-10-11 20:50:21 +00:00
moved-upvar-mut-rebind-11958.stderr
Diagnose liveness on MIR.
2025-10-11 20:50:21 +00:00
multiple-fn-bounds.rs
Move /src/test to /tests
2023-01-11 09:32:08 +00:00
multiple-fn-bounds.stderr
Show diff suggestion format on verbose replacement
2025-02-10 20:21:39 +00:00
no-capture-closure-call.rs
cleaned up some tests
2025-07-10 18:50:35 +05:00
old-closure-arg-call-as.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-arg.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-explicit-types.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-expr-precedence.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-expr-precedence.stderr
bless tests with new lint messages
2025-08-19 21:27:10 +02:00
old-closure-expression-remove-semicolon.fixed
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-expression-remove-semicolon.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-expression-remove-semicolon.stderr
Show number in error message even for one error
2023-11-24 19:15:52 +01:00
old-closure-fn-coerce.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-iter-1.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
old-closure-iter-2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
once-move-out-on-heap.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
opaque-upvar.rs
Be a bit more relaxed about not yet constrained infer vars in closure upvar analysis
2025-05-05 19:06:45 +00:00
return-type-doesnt-match-bound.rs
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
return-type-doesnt-match-bound.stderr
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
return-value-lifetime-error.fixed
Provide suggestion to dereference closure tail if appropriate
2024-04-05 19:42:55 +00:00
return-value-lifetime-error.rs
Provide suggestion to dereference closure tail if appropriate
2024-04-05 19:42:55 +00:00
return-value-lifetime-error.stderr
Provide suggestion to dereference closure tail if appropriate
2024-04-05 19:42:55 +00:00
self-supertrait-bounds.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
semistatement-in-lambda.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
static-closures-with-nonstatic-return.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
supertrait-hint-cycle-2.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
supertrait-hint-cycle-3.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
supertrait-hint-cycle.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
supertrait-hint-references-assoc-ty.rs
"normalize" signature before checking mentions self
2025-01-28 14:11:29 +00:00
thir-unsafeck-issue-85871.rs
[AUTO-GENERATED] Migrate ui tests from // to //@ directives
2024-02-16 20:02:50 +00:00
unused-closure-ice-16256.rs
comments
2025-08-09 16:27:20 +05:00
unused-closure-ice-16256.stderr
bless tests with new lint messages
2025-08-19 21:27:10 +02:00
upvar-or-pattern-issue-138958.rs
Add a regression test for TestCase::Or without place
2025-03-26 02:25:01 +01:00
wrong-closure-arg-suggestion-125325.rs
UI tests: add missing diagnostic kinds where possible
2025-04-08 23:06:31 +03:00
wrong-closure-arg-suggestion-125325.stderr
Make suggestion to change Fn to FnMut work with methods well
2024-06-10 16:28:05 +05:30