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Matthias Krüger 12cc9b4b6f Rollup merge of #135044 - compiler-errors:better-infer-suggestions-in-const, r=oli-obk 
Improve infer (`_`) suggestions in `const`s and `static`s

Fixes https://github.com/rust-lang/rust/issues/135010.

This PR does a few things to (imo) greatly improve the error message when users write something like `static FOO: [i32; _] = [1, 2, 3]`.

Firstly, it adapts the recovery code for when we encounter `_` in a const/static to work a bit more like `fn foo() -> _`, and removes the somewhat redundant query `diagnostic_only_typeck`.

Secondly, it changes the lowering for `[T; _]` to always lower under the `feature(generic_arg_infer)` logic to `ConstArgKind::Infer`. We still issue the feature error, so it's not doing anything *observable* on the good path, but it does mean that we no longer erroneously interpret `[T; _]`'s array length as a `_` **wildcard expression** (à la destructuring assignment, like `(_, y) = expr`).

Lastly it makes the suggestions verbose and fixes (well, suppresses) a bug with stashing and suggestions.

r? oli-obk
2025-01-03 22:12:45 +01:00
..
abi
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
alloc-error
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
allocator
…
annotate-snippet
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
anon-params
…
argfile
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
argument-suggestions
…
array-slice-vec
Make suggestion verbose and tweak error message
2025-01-02 23:39:17 +00:00
asan-odr-win
…
asm
Note def descr in NonConstFunctionCall
2024-12-23 22:15:32 +00:00
associated-consts
Add ignore-rustc-debug-assertions to tests/ui/associated-consts/issue-93775.rs
2024-12-22 14:49:01 +08:00
associated-inherent-types
Spruce up the docs of several queries related to the type/trait system and const eval
2024-12-27 11:44:23 +01:00
associated-item
…
associated-type-bounds
Rollup merge of #133660 - compiler-errors:trait-obj-missing-assoc, r=lcnr
2024-12-01 08:15:25 +01:00
associated-types
chore: fix typos
2024-12-30 14:56:21 +07:00
async-await
Suppress type param suggestion if encountering invalid const infer
2025-01-02 23:39:16 +00:00
attributes
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
auto-traits
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
autodiff
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
autoref-autoderef
…
auxiliary
do not implement unsafe auto traits for types with unsafe fields
2024-12-05 23:52:21 +00:00
backtrace
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
bench
…
binding
Tweak output of some const pattern errors
2024-12-04 20:29:36 +00:00
binop
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
blind
…
block-result
…
bootstrap
Adjust rustc_bootstap.rs ui test
2024-12-20 02:38:46 +08:00
borrowck
Fix span for IndexMut method call on HashMap/BTreeMap
2024-12-31 02:21:17 +00:00
box
Allow fn pointers comparisons lint in UI tests
2024-12-02 18:43:37 +01:00
btreemap
Use if-let in structured suggestion instead of Option::map
2024-12-31 02:21:17 +00:00
builtin-superkinds
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
c-variadic
Rollup merge of #133620 - dev-ardi:simplify-hir_typeck_pass_to_variadic_function, r=compiler-errors
2024-11-30 12:56:54 +08:00
cast
…
cfg
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
check-cfg
Make the test cfg a "userspace" check-cfg
2025-01-02 16:49:55 +01:00
closure_context
…
closure-expected-type
…
closures
chore: fix some typos
2024-12-31 15:11:18 +08:00
cmse-nonsecure
Stabilize extended_varargs_abi_support
2024-11-27 22:21:33 +01:00
codegen
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
codemap_tests
Filter empty lines, comments and delimiters from previous to last multiline span rendering
2024-12-12 23:36:27 +00:00
coercion
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
coherence
reword trait bound suggestion message to include the bounds
2024-12-07 21:26:20 +00:00
coinduction
…
command
…
compare-method
…
compiletest-self-test
compiletest: Self-test for normalize-* with revisions
2024-12-28 13:57:13 +11:00
conditional-compilation
…
confuse-field-and-method
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const_prop
Tweak unevaluated constant in pattern error
2024-12-04 20:29:35 +00:00
const-generics
Rollup merge of #135044 - compiler-errors:better-infer-suggestions-in-const, r=oli-obk
2025-01-03 22:12:45 +01:00
const-ptr
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
consts
Rollup merge of #135044 - compiler-errors:better-infer-suggestions-in-const, r=oli-obk
2025-01-03 22:12:45 +01:00
coroutine
chore: fix some typos
2024-12-31 15:11:18 +08:00
coverage-attr
Un-redact one occurrence of "coverage attribute not allowed here"
2024-12-25 19:23:48 +11:00
crate-loading
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
cross
…
cross-crate
Allow fn pointers comparisons lint in UI tests
2024-12-02 18:43:37 +01:00
custom_test_frameworks
…
cycle-trait
…
dataflow_const_prop
dataflow_const_prop: do not eval a ptr address in SwitchInt
2024-12-09 21:06:29 +08:00
debuginfo
Simplify or delete normalize directives that don't care about bit-width
2024-12-27 12:42:07 +11:00
definition-reachable
…
delegation
…
dep-graph
…
deprecation
…
deref-patterns
…
derived-errors
…
derives
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
deriving
make CoercePointee errors translatable
2024-12-04 20:34:48 +08:00
dest-prop
…
destructuring-assignment
Introduce default_field_values feature
2024-12-09 21:55:01 +00:00
diagnostic_namespace
Also warn against #[diagnostic::do_not_recommend] on plain impls
2024-12-18 07:10:55 +01:00
diagnostic-flags
Adjust allow-non-lint-warnings.rs
2024-12-10 11:29:43 +08:00
diagnostic-width
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
did_you_mean
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directory_ownership
…
disallowed-deconstructing
…
dollar-crate
…
drop
Always run tail_expr_drop_order lint on promoted MIR
2024-12-23 20:25:41 +00:00
drop-bounds
…
dropck
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
dst
…
duplicate
chore: fix typos
2024-12-31 23:46:39 +08:00
dyn-compatibility
taint fcx on selection errors during unsizing
2025-01-02 19:16:00 +01:00
dyn-drop
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dyn-keyword
…
dyn-star
Rollup merge of #134642 - kpreid:pointerlike-cell, r=compiler-errors
2024-12-22 21:59:27 +01:00
dynamically-sized-types
…
editions
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
empty
…
entry-point
…
enum
…
enum-discriminant
fix ICE on type error in promoted
2024-12-09 15:17:26 +01:00
env-macro
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error-codes
Make suggestion verbose and tweak error message
2025-01-02 23:39:17 +00:00
error-emitter
Account for removal of multiline span in suggestion
2024-12-26 17:41:43 +00:00
errors
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
explicit
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explicit-tail-calls
Note def descr in NonConstFunctionCall
2024-12-23 22:15:32 +00:00
expr
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
extern
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
extern-flag
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feature-gates
Unconditionally lower generic_arg_infer
2025-01-02 23:39:16 +00:00
ffi-attrs
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float
…
fmt
add suggestion for wrongly ordered format parameters
2024-12-30 06:14:26 -08:00
fn
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fn-main
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for
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
for-loop-while
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foreign
…
fully-qualified-type
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function-pointer
Remove a duplicated check that doesn't do anything anymore.
2024-12-19 10:56:31 +00:00
functional-struct-update
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functions-closures
…
generic-associated-types
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
generic-const-items
Remove diagnostic_only_typeck and fix placeholder suggestion for const/static
2025-01-02 23:39:16 +00:00
generics
Use a more precise span in placeholder_type_error_diag
2024-12-13 13:07:07 +01:00
half-open-range-patterns
…
hashmap
Use if-let in structured suggestion instead of Option::map
2024-12-31 02:21:17 +00:00
hello_world
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higher-ranked
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
hygiene
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
illegal-sized-bound
…
impl-header-lifetime-elision
…
impl-trait
Fix ICE when opaque captures a duplicated/invalid lifetime
2025-01-01 19:32:51 +00:00
implied-bounds
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imports
…
include-macros
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
incoherent-inherent-impls
chore: fix typos
2024-12-31 23:46:39 +08:00
indexing
chore: fix typos
2024-12-31 23:46:39 +08:00
inference
chore: fix typos
2024-12-31 23:46:39 +08:00
infinite
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
inherent-impls-overlap-check
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
inline-const
review comments: reword messages and simplify logic
2024-12-04 20:49:05 +00:00
instrument-coverage
…
instrument-xray
…
interior-mutability
…
internal
…
internal-lints
Remove rustc::existing_doc_keyword lint.
2024-12-17 13:56:10 +11:00
intrinsics
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
invalid
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
invalid-compile-flags
tests: add basic test coverage for cli flag --crate-type
2024-12-30 19:10:43 +08:00
invalid-module-declaration
…
invalid-self-argument
…
io-checks
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
issues
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
iterators
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
json
…
keyword
…
kindck
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
label
…
lang-items
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
late-bound-lifetimes
…
layout
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
lazy-type-alias
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
lazy-type-alias-impl-trait
…
let-else
Suggest using deref in patterns
2024-12-13 14:18:41 -08:00
lexer
…
lifetimes
Rollup merge of #134181 - estebank:trim-render, r=oli-obk
2024-12-14 03:54:31 +01:00
limits
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
link-native-libs
Add comments to -Zlink-* tests
2024-12-31 02:25:35 +00:00
linkage-attr
Move more tests into tests/ui/link-native-libs
2024-12-07 13:18:05 +11:00
lint
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
liveness
…
loops
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
lowering
…
lto
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
lub-glb
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
macro_backtrace
…
macros
Rollup merge of #135044 - compiler-errors:better-infer-suggestions-in-const, r=oli-obk
2025-01-03 22:12:45 +01:00
malformed
…
marker_trait_attr
…
match
Rollup merge of #133486 - dianne:fix-move-error-suggestion, r=estebank
2024-12-31 18:42:23 -05:00
meta
…
methods
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
mir
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
mir-dataflow
…
mismatched_types
Add more info on type/trait mismatches for different crate versions
2024-12-07 18:18:08 +00:00
missing
…
missing_non_modrs_mod
…
missing-trait-bounds
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
modules
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
modules_and_files_visibility
…
moves
Rollup merge of #133486 - dianne:fix-move-error-suggestion, r=estebank
2024-12-31 18:42:23 -05:00
mut
…
namespace
…
never_type
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
nll
Rollup merge of #133486 - dianne:fix-move-error-suggestion, r=estebank
2024-12-31 18:42:23 -05:00
no_std
…
non_modrs_mods
…
non_modrs_mods_and_inline_mods
…
not-panic
…
numbers-arithmetic
…
numeric
…
object-lifetime
…
obsolete-in-place
…
offset-of
…
on-unimplemented
…
operator-recovery
…
or-patterns
Filter empty lines, comments and delimiters from previous to last multiline span rendering
2024-12-12 23:36:27 +00:00
overloaded
…
packed
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
panic-handler
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
panic-runtime
…
panics
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
parallel-rustc
…
parser
Remove diagnostic_only_typeck and fix placeholder suggestion for const/static
2025-01-02 23:39:16 +00:00
patchable-function-entry
…
pattern
Rollup merge of #133486 - dianne:fix-move-error-suggestion, r=estebank
2024-12-31 18:42:23 -05:00
pin-macro
…
precondition-checks
…
print_type_sizes
…
print-request
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
privacy
Filter empty lines, comments and delimiters from previous to last multiline span rendering
2024-12-12 23:36:27 +00:00
proc-macro
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
process
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
process-termination
…
ptr_ops
…
pub
…
qualified
…
query-system
…
range
Provide diagnostic for Struct(a, .., z) expression
2024-12-09 21:55:12 +00:00
raw-ref-op
Auto merge of #134294 - matthiaskrgr:rollup-anh6io8, r=matthiaskrgr
2024-12-14 06:44:05 +00:00
reachable
Consider arm to diverge if guard diverges
2024-12-24 19:12:13 +00:00
recursion
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
recursion_limit
…
regions
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
repeat-expr
…
repr
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
reserved
…
resolve
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
return
Filter empty lines, comments and delimiters from previous to last multiline span rendering
2024-12-12 23:36:27 +00:00
rfcs
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
rmeta
…
runtime
Disable backtrace-debuginfo.rs on windows-gnu
2024-12-28 11:19:16 +08:00
rust-2018
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
rust-2021
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
rust-2024
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
rustc-env
…
rustdoc
Remove rustc::existing_doc_keyword lint.
2024-12-17 13:56:10 +11:00
sanitizer
Stabilize async closures
2024-12-13 00:04:56 +00:00
self
Rollup merge of #134524 - adetaylor:getref, r=compiler-errors
2024-12-21 01:30:16 +01:00
sepcomp
…
shadowed
…
shell-argfiles
…
simd
Rollup merge of #133395 - calebzulawski:simd_relaxed_fma, r=workingjubilee
2024-12-03 07:48:33 +01:00
single-use-lifetime
…
sized
…
span
Arbitrary self types v2: adjust diagnostic.
2024-12-13 15:40:37 +00:00
specialization
Auto merge of #134258 - bjorn3:no_public_specialization, r=petrochenkov
2024-12-15 04:45:24 +00:00
stability-attribute
Filter empty lines, comments and delimiters from previous to last multiline span rendering
2024-12-12 23:36:27 +00:00
stable-mir-print
Auto merge of #133734 - scottmcm:lower-indexing-to-ptrmetadata, r=davidtwco,RalfJung
2024-12-14 22:43:39 +00:00
stack-protector
…
static
Note def descr in NonConstFunctionCall
2024-12-23 22:15:32 +00:00
statics
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
stats
Fix ICE when opaque captures a duplicated/invalid lifetime
2025-01-01 19:32:51 +00:00
std
…
stdlib-unit-tests
Adjust atomic-from-mut-not-available.rs
2024-12-08 15:32:04 +08:00
str
…
structs
Provide structured suggestion for impl Default of type where all fields have defaults
2024-12-31 18:06:01 +00:00
structs-enums
add alignment info for test
2024-12-16 14:59:10 -05:00
suggestions
Make suggestion verbose and tweak error message
2025-01-02 23:39:17 +00:00
svh
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
symbol-mangling-version
…
symbol-names
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
sync
…
target-feature
Auto merge of #134349 - jieyouxu:rollup-zqn0jox, r=jieyouxu
2024-12-15 19:14:24 +00:00
test-attrs
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
thir-print
Introduce default_field_values feature
2024-12-09 21:55:01 +00:00
thread-local
stabilize const_swap
2024-12-25 10:36:32 +01:00
threads-sendsync
…
tool-attributes
Always run tail_expr_drop_order lint on promoted MIR
2024-12-23 20:25:41 +00:00
track-diagnostics
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
trait-bounds
Tweak wording
2024-12-07 22:18:51 +00:00
traits
Auto merge of #134692 - GrigorenkoPV:sync_poision, r=tgross35
2025-01-03 06:40:28 +00:00
transmutability
Filter empty lines, comments and delimiters from previous to last multiline span rendering
2024-12-12 23:36:27 +00:00
transmute
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
treat-err-as-bug
Try to write the panic message with a single write_all call
2025-01-01 15:58:29 +01:00
trivial-bounds
…
try-block
…
try-trait
…
tuple
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
type
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
type-alias
Do not talk about "trait <Foo = Bar>"
2024-12-07 21:37:15 +00:00
type-alias-enum-variants
…
type-alias-impl-trait
Rollup merge of #134181 - estebank:trim-render, r=oli-obk
2024-12-14 03:54:31 +01:00
type-inference
…
typeck
Rollup merge of #135044 - compiler-errors:better-infer-suggestions-in-const, r=oli-obk
2025-01-03 22:12:45 +01:00
typeof
…
ufcs
Arbitrary self types v2: adjust diagnostic.
2024-12-13 15:40:37 +00:00
unboxed-closures
…
underscore-imports
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
underscore-lifetime
…
uniform-paths
…
uninhabited
…
union
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
unknown-unstable-lints
Point at lint name instead of whole attr for gated lints
2024-12-18 19:27:44 +00:00
unop
Mention type parameter in more cases and don't suggest ~const bound already there
2024-12-07 21:37:13 +00:00
unpretty
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
unresolved
…
unsafe
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
unsafe-binders
Begin to implement type system layer of unsafe binders
2024-12-22 21:57:57 +00:00
unsafe-fields
Make Copy unsafe to implement for ADTs with unsafe fields
2024-12-07 20:50:00 +00:00
unsized
Remove polymorphization
2024-12-06 16:42:09 -05:00
unsized-locals
…
unused-crate-deps
…
unwind-abis
…
use
…
variance
…
variants
…
version
…
warnings
…
wasm
…
wf
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
where-clauses
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
while
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
windows-subsystem
…
zero-sized
…
.gitattributes
…
attr-start.rs
…
augmented-assignments-feature-gate-cross.rs
…
augmented-assignments-rpass.rs
…
augmented-assignments.rs
…
augmented-assignments.stderr
…
auto-instantiate.rs
…
auto-ref-slice-plus-ref.rs
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README.md

UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and interpret a test.

As part of an ongoing effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as a legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.