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bors 7daf4cf911 Auto merge of #133138 - azhogin:azhogin/target-modifiers, r=davidtwco,saethlin 
Target modifiers (special marked options) are recorded in metainfo

Target modifiers (special marked options) are recorded in metainfo and compared to be equal in different linked crates.

PR for this RFC: https://github.com/rust-lang/rfcs/pull/3716

Option may be marked as `TARGET_MODIFIER`, example: `regparm: Option<u32> = (None, parse_opt_number, [TRACKED TARGET_MODIFIER]`.
If an TARGET_MODIFIER-marked option has non-default value, it will be recorded in crate metainfo as a `Vec<TargetModifier>`:
```
pub struct TargetModifier {
    pub opt: OptionsTargetModifiers,
    pub value_name: String,
}
```

OptionsTargetModifiers is a macro-generated enum.

Option value code (for comparison) is generated using `Debug` trait.

Error example:
```
error: mixing `-Zregparm` will cause an ABI mismatch in crate `incompatible_regparm`
  --> $DIR/incompatible_regparm.rs:10:1
   |
LL | #![crate_type = "lib"]
   | ^
   |
   = help: the `-Zregparm` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
   = note: `-Zregparm=1` in this crate is incompatible with `-Zregparm=2` in dependency `wrong_regparm`
   = help: set `-Zregparm=2` in this crate or `-Zregparm=1` in `wrong_regparm`
   = help: if you are sure this will not cause problems, use `-Cunsafe-allow-abi-mismatch=regparm` to silence this error

error: aborting due to 1 previous error
```

`-Cunsafe-allow-abi-mismatch=regparm,reg-struct-return` to disable list of flags.
2025-02-03 07:16:57 +00:00
..
abi
Insert null checks for pointer dereferences when debug assertions are enabled
2025-01-31 11:13:34 +00:00
alloc-error
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
allocator
UI tests: Rename "object safe" to "dyn compatible"
2024-10-10 01:13:29 +02:00
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
Added more scenarios where commas need to be removed
2024-10-20 17:14:53 +08:00
array-slice-vec
Fix off-by-one error causing driftsort to crash
2025-01-28 23:39:46 -08:00
asm
Remove duplicated code in RISC-V asm bad-reg test
2025-01-28 23:49:02 +09:00
associated-consts
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +01:00
associated-inherent-types
Manually walk into WF obligations in BestObligation proof tree visitor
2025-01-31 18:21:58 +00:00
associated-item
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +01:00
associated-type-bounds
Do not assume child bound assumptions for rigid alias
2025-01-28 19:08:50 +00:00
associated-types
Rollup merge of #135073 - joshtriplett:bstr, r=BurntSushi
2025-01-23 19:54:23 +01:00
async-await
Rollup merge of #136414 - estebank:expected-return-type, r=oli-obk
2025-02-02 23:06:55 +01:00
attributes
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
auto-traits
Normalize each signature input/output in typeck_with_fallback with its own span
2025-01-06 17:58:30 +00:00
autodiff
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
autoref-autoderef
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
auxiliary
do not implement unsafe auto traits for types with unsafe fields
2024-12-05 23:52:21 +00:00
backtrace
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
bench
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
binding
Tweak output of some const pattern errors
2024-12-04 20:29:36 +00:00
binop
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
blind
…
block-result
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
bootstrap
Adjust rustc_bootstap.rs ui test
2024-12-20 02:38:46 +08:00
borrowck
diagnostics: fix borrowck suggestions for if/while let conditionals
2025-02-01 14:39:43 -07:00
box
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
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
best_blame_constraint: don't filter constraints by sup SCC
2025-01-06 16:08:29 -08:00
cast
best_blame_constraint: prioritize blaming interesting-seeming constraints
2025-01-06 16:12:11 -08:00
cfg
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
check-cfg
Rollup merge of #134358 - workingjubilee:configure-my-riscv-abi, r=fmease
2025-01-26 01:51:15 -05:00
closure_context
…
closure-expected-type
…
closures
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
cmse-nonsecure
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +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
Rework "long type names" printing logic
2025-01-31 20:39:01 +00:00
coherence
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +01:00
coinduction
…
command
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
compare-method
…
compiletest-self-test
compiletest: Self-test for normalize-* with revisions
2024-12-28 13:57:13 +11:00
conditional-compilation
Update tests.
2025-01-07 16:04:14 +01:00
confuse-field-and-method
Use extract_callable_info, generalize it to async closure
2024-11-02 03:53:59 +00:00
const_prop
Tweak unevaluated constant in pattern error
2024-12-04 20:29:35 +00:00
const-generics
Rollup merge of #135900 - compiler-errors:derive-wf, r=lcnr
2025-02-01 01:19:19 +01:00
const-ptr
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
consts
Rollup merge of #136325 - compiler-errors:indirectly, r=RalfJung
2025-01-31 12:28:18 +01:00
coroutine
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
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
Add tests for windows-gnu split-debuginfo options
2025-01-20 15:38:07 -06:00
definition-reachable
…
delegation
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
dep-graph
…
deprecation
Emit a single privacy error for multiple fields on the same struct expression
2025-01-18 20:33:15 +00:00
deref-patterns
…
derived-errors
…
derives
make rustc_encodable_decodable feature properly unstable
2025-01-14 16:16:38 +01:00
deriving
Skip suggestions in derived code
2025-01-24 22:08:39 +00:00
dest-prop
…
destructuring-assignment
Introduce default_field_values feature
2024-12-09 21:55:01 +00:00
diagnostic_namespace
Manually walk into WF obligations in BestObligation proof tree visitor
2025-01-31 18:21:58 +00:00
diagnostic-flags
Adjust allow-non-lint-warnings.rs
2024-12-10 11:29:43 +08:00
diagnostic-width
Rework "long type names" printing logic
2025-01-31 20:39:01 +00:00
did_you_mean
Rollup merge of #135860 - fmease:compiler-mv-obj-save-dyn-compat-ii, r=jieyouxu
2025-01-31 12:28:15 +01:00
directory_ownership
…
disallowed-deconstructing
…
dollar-crate
…
drop
Rollup merge of #135926 - jieyouxu:needs-subprocess-thread, r=oli-obk
2025-01-24 16:25:43 +01:00
drop-bounds
…
dropck
best_blame_constraint: add a special case to recover object lifetime default notes
2025-01-06 16:12:04 -08:00
dst
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
duplicate
remove support for the #[start] attribute
2025-01-21 06:59:15 -07:00
dyn-compatibility
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +01:00
dyn-drop
…
dyn-keyword
Suggest typos when trait path expression is typod
2025-01-11 18:44:12 +00:00
dyn-star
Rollup merge of #134642 - kpreid:pointerlike-cell, r=compiler-errors
2024-12-22 21:59:27 +01:00
dynamically-sized-types
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
editions
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
empty
Update tests for new TRPL chapter order
2024-11-23 08:57:25 -07:00
entry-point
…
enum
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
enum-discriminant
Add TooGeneric variant to LayoutError and emit Unknown one
2025-01-27 00:37:34 +01:00
env-macro
…
error-codes
rustc_allowed_through_unstable_modules: require deprecation message
2025-02-02 12:36:12 +01:00
error-emitter
Highlight clarifying information in "expected/found" error
2025-02-02 02:39:43 +00:00
errors
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
explicit
…
explicit-tail-calls
add a regression test
2025-01-24 18:33:00 +01:00
expr
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
extern
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
extern-flag
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
feature-gates
Rollup merge of #134272 - RalfJung:destabilize-rustc_encodable_decodable, r=oli-obk
2025-02-02 18:05:22 +01:00
ffi-attrs
…
float
move f16/f128 const fn under f16/f128 feature gate
2024-10-05 10:13:18 +02:00
fmt
add suggestion for wrongly ordered format parameters
2024-12-30 06:14:26 -08:00
fn
Tweak fn pointer suggestion span
2025-02-02 00:46:02 +00:00
fn-main
…
for
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
for-loop-while
Auto merge of #134478 - compiler-errors:attr-span, r=oli-obk
2025-01-22 14:46:41 +00:00
force-inlining
Tweak fn pointer suggestion span
2025-02-02 00:46:02 +00:00
foreign
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
fully-qualified-type
…
function-pointer
Remove a duplicated check that doesn't do anything anymore.
2024-12-19 10:56:31 +00:00
functional-struct-update
Update tests for hidden references to mutable static
2024-09-13 14:10:56 +03:00
functions-closures
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
generic-associated-types
Rollup merge of #135860 - fmease:compiler-mv-obj-save-dyn-compat-ii, r=jieyouxu
2025-01-31 12:28:15 +01:00
generic-const-items
Rollup merge of #136168 - fmease:gci-fix-mono, r=compiler-errors
2025-01-29 06:03:23 +01:00
generics
Bless and add tests
2025-01-23 06:01:36 +00:00
half-open-range-patterns
Update tests for new TRPL chapter order
2024-11-23 08:57:25 -07:00
hashmap
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
hello_world
…
higher-ranked
Rollup merge of #136414 - estebank:expected-return-type, r=oli-obk
2025-02-02 23:06:55 +01:00
hygiene
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
illegal-sized-bound
…
impl-header-lifetime-elision
…
impl-trait
Rollup merge of #136415 - estebank:highlight-clarification, r=compiler-errors
2025-02-02 18:05:24 +01:00
implied-bounds
Adjust tests
2024-09-05 06:37:38 -04:00
imports
Auto merge of #133154 - estebank:issue-133137, r=wesleywiser
2025-01-25 11:41:21 +00:00
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
Bless new test output (new trait impls in lists of suggestions)
2025-01-11 06:35:21 +02:00
infinite
normalize long-type.txt in tests
2025-01-30 17:10:19 +00:00
inherent-impls-overlap-check
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
inline-const
Make sure to walk into nested const blocks in RegionResolutionVisitor
2025-01-09 22:16:51 +00:00
instrument-coverage
coverage. Adapt to mcdc mapping formats introduced by llvm 19
2024-10-08 11:15:24 +08:00
instrument-xray
…
interior-mutability
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
internal
use backticks instead of single quotes when reporting "use of unstable library feature"
2024-11-03 13:55:52 -08:00
internal-lints
Remove rustc::existing_doc_keyword lint.
2024-12-17 13:56:10 +11:00
intrinsics
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
invalid
Update tests.
2025-01-07 16:04:14 +01:00
invalid-compile-flags
Only test proc-macro invalid compile flags with panic=unwind
2025-01-08 18:00:26 +00:00
invalid-module-declaration
…
invalid-self-argument
…
io-checks
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
issues
Auto merge of #136350 - matthiaskrgr:rollup-6eqfyvh, r=matthiaskrgr
2025-01-31 20:16:46 +00:00
iterators
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
json
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
keyword
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
kindck
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +01:00
label
…
lang-items
remove support for the #[start] attribute
2025-01-21 06:59:15 -07:00
late-bound-lifetimes
…
layout
Add TooGeneric variant to LayoutError and emit Unknown one
2025-01-27 00:37:34 +01:00
lazy-type-alias
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
lazy-type-alias-impl-trait
…
let-else
Suggest using deref in patterns
2024-12-13 14:18:41 -08:00
lexer
Annotate input reference tests
2024-10-30 16:47:47 -07:00
lifetimes
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
limits
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
link-native-libs
Update tests.
2025-01-07 16:04:14 +01:00
linkage-attr
Move more tests into tests/ui/link-native-libs
2024-12-07 13:18:05 +11:00
lint
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
liveness
omit unused args warnings for intrinsics without body
2025-01-23 14:32:21 -05:00
loops
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
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
Auto merge of #133154 - estebank:issue-133137, r=wesleywiser
2025-01-25 11:41:21 +00:00
malformed
…
marker_trait_attr
…
match
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
meta
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
methods
Do not ICE when encountering predicates from other items in method error reporting
2025-01-03 19:39:39 +00:00
mir
Insert null checks for pointer dereferences when debug assertions are enabled
2025-01-31 11:13:34 +00:00
mir-dataflow
Remove the DefinitelyInitializedPlaces analysis.
2024-11-22 17:02:04 +11:00
mismatched_types
"normalize" signature before checking mentions self
2025-01-28 14:11:29 +00:00
missing
Reword suggestion message
2024-11-16 20:03:31 +00:00
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
Point at invalid utf-8 span on user's source code
2025-01-22 00:52:27 +00:00
modules_and_files_visibility
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
moves
Remove CallKind::Deref hack from UseSpans
2025-01-06 03:55:19 +00:00
mut
Tweak &mut self suggestion span
2025-01-28 19:35:51 +00:00
namespace
…
never_type
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
nll
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
no_std
…
non_modrs_mods
…
non_modrs_mods_and_inline_mods
…
not-panic
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
numbers-arithmetic
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
numeric
…
object-lifetime
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
obsolete-in-place
…
offset-of
Update tests.
2025-01-07 16:04:14 +01:00
on-unimplemented
Rollup merge of #132583 - mejrs:tuples, r=compiler-errors
2024-11-04 18:12:48 +01:00
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
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
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
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
panics
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
parallel-rustc
Add regression test
2025-01-26 13:55:59 +00:00
parser
Trim extra whitespace in fn ptr suggestion span
2025-01-27 17:17:22 +00:00
patchable-function-entry
…
pattern
Rollup merge of #135434 - dianne:match-2024-for-edition-2024, r=Nadrieril
2025-01-30 12:45:18 +01:00
pin-macro
use backticks instead of single quotes when reporting "use of unstable library feature"
2024-11-03 13:55:52 -08:00
precondition-checks
Warn on redundant --cfg directive when revisions are used
2024-10-19 12:40:12 +00:00
print_type_sizes
remove support for the #[start] attribute
2025-01-21 06:59:15 -07:00
print-request
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
privacy
Fix tests/ui/privacy/sysroot-private
2025-01-28 19:42:32 +03:00
proc-macro
fully de-stabilize all custom inner attributes
2025-01-19 08:53:02 -07:00
process
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
process-termination
…
ptr_ops
…
pub
Bless test fallout
2024-08-03 07:57:31 -04:00
qualified
…
query-system
depth limit eval_to_const_value_raw
2025-01-06 08:54:27 +01:00
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
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
recursion
normalize long-type.txt in tests
2025-01-30 17:10:19 +00:00
recursion_limit
…
regions
new solver: prefer trivial builtin impls over where-clauses
2025-01-17 18:50:29 +00:00
repeat-expr
Always take the Ok path in lit_to_const and produce error constants instead
2025-01-09 08:48:00 +00:00
repr
adjust UI tests
2025-01-10 02:22:57 +01:00
reserved
…
resolve
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +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
Rollup merge of #136112 - fmease:clean-up-all-dead-files-in-ui-tests, r=compiler-errors
2025-01-27 15:38:29 +01:00
rmeta
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
runtime
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
rust-2018
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
rust-2021
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
rust-2024
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
rustc-env
…
rustdoc
Remove rustc::existing_doc_keyword lint.
2024-12-17 13:56:10 +11:00
sanitizer
Locate asan-odr-win with other sanitizer tests
2025-01-27 19:35:53 +01:00
self
Rollup merge of #135860 - fmease:compiler-mv-obj-save-dyn-compat-ii, r=jieyouxu
2025-01-31 12:28:15 +01:00
sepcomp
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
shadowed
…
shell-argfiles
…
simd
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
single-use-lifetime
…
sized
Update tests for new TRPL chapter order
2024-11-23 08:57:25 -07:00
span
Bless and add tests
2025-01-23 06:01:36 +00:00
specialization
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
stability-attribute
rustc_allowed_through_unstable_modules: require deprecation message
2025-02-02 12:36:12 +01:00
stable-mir-print
Reapply "Auto merge of #133734 - scottmcm:lower-indexing-to-ptrmetadata, r=davidtwco,RalfJung"
2025-01-27 23:42:47 +00:00
stack-protector
…
static
Note def descr in NonConstFunctionCall
2024-12-23 22:15:32 +00:00
statics
Compiler: Finalize dyn compatibility renaming
2025-01-26 21:20:31 +01:00
stats
Fix ICE when opaque captures a duplicated/invalid lifetime
2025-01-01 19:32:51 +00:00
std
tests: cleanup tests/ui/std/thread-sleep-ms.rs
2025-01-23 20:51:29 +08:00
stdlib-unit-tests
Adjust atomic-from-mut-not-available.rs
2024-12-08 15:32:04 +08:00
str
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
structs
Add TooGeneric variant to LayoutError and emit Unknown one
2025-01-27 00:37:34 +01:00
structs-enums
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
suggestions
Rollup merge of #136414 - estebank:expected-return-type, r=oli-obk
2025-02-02 23:06:55 +01:00
svh
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
symbol-mangling-version
…
symbol-names
Failing test
2025-01-06 06:11:06 +00:00
sync
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
target_modifiers
Target modifiers (special marked options) are recorded in metainfo and compared to be equal in different crates
2025-02-02 22:12:49 +07:00
target-feature
ABI-required target features: warn when they are missing in base CPU (rather than silently enabling them)
2025-01-28 04:40:42 +01:00
test-attrs
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
thir-print
Eliminate PatKind::Path
2025-01-29 15:45:13 +00:00
thread-local
stabilize const_swap
2024-12-25 10:36:32 +01:00
threads-sendsync
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
tool-attributes
Reword "crate not found" resolve message
2025-01-24 01:19:50 +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
Rollup merge of #136328 - estebank:long-ty-path, r=jieyouxu,lqd
2025-02-02 12:31:56 +01:00
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
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
trivial-bounds
…
try-block
Add trait diff highlighting logic and use it in E0277
2024-11-02 03:08:04 +00:00
try-trait
Trim output of E0277 in some cases
2024-11-02 03:08:04 +00:00
tuple
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
type
Maintain a list of types permitted per pattern
2025-02-02 19:30:53 +00:00
type-alias
Do not talk about "trait <Foo = Bar>"
2024-12-07 21:37:15 +00:00
type-alias-enum-variants
Suggest the struct variant pattern syntax on usage of unit variant pattern for a struct variant
2024-08-28 22:55:57 +09:00
type-alias-impl-trait
Shorten error message for callable with wrong return type
2025-02-02 01:00:33 +00:00
type-inference
…
typeck
Rollup merge of #136403 - fmease:fix-a-ui-test, r=oli-obk
2025-02-02 23:06:55 +01:00
typeof
…
ufcs
Arbitrary self types v2: adjust diagnostic.
2024-12-13 15:40:37 +00:00
unboxed-closures
best_blame_constraint: don't filter constraints by sup SCC
2025-01-06 16:08:29 -08:00
underscore-imports
Update tests to use new proc-macro header
2024-11-27 07:18:25 -08:00
underscore-lifetime
best_blame_constraint: don't filter constraints by sup SCC
2025-01-06 16:08:29 -08:00
uniform-paths
…
uninhabited
Remove all dead files inside tests/ui/
2025-01-27 02:28:04 +01:00
union
Manually walk into WF obligations in BestObligation proof tree visitor
2025-01-31 18:21:58 +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
Point at invalid utf-8 span on user's source code
2025-01-22 00:52:27 +00:00
unresolved
Reword "crate not found" resolve message
2025-01-24 01:19:50 +00:00
unsafe
Use links to edition guide for edition migrations
2024-12-15 20:28:16 -08:00
unsafe-binders
Enforce unsafe binders must be Copy (for now)
2025-01-31 17:40:28 +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
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
unused-crate-deps
…
unwind-abis
…
use
Auto merge of #134299 - RalfJung:remove-start, r=compiler-errors
2025-01-21 19:46:20 +00:00
variance
Make UniqueRc invariant for soundness
2025-01-11 22:36:25 +01:00
variants
…
version
…
warnings
…
wasm
Add test
2025-01-23 10:55:01 +00:00
wf
Rollup merge of #135900 - compiler-errors:derive-wf, r=lcnr
2025-02-01 01:19:19 +01:00
where-clauses
Don't pick T: FnPtr nested goals
2025-01-22 06:55:38 +00:00
while
Tweak multispan rendering
2024-12-12 23:36:27 +00:00
windows-subsystem
…
zero-sized
…
.gitattributes
…
augmented-assignments-feature-gate-cross.rs
…
augmented-assignments-rpass.rs
…
augmented-assignments.rs
Peel off explicit (or implicit) deref before suggesting clone on move error in borrowck
2024-07-26 14:41:56 -04:00
augmented-assignments.stderr
Peel off explicit (or implicit) deref before suggesting clone on move error in borrowck
2024-07-26 14:41:56 -04:00
auto-instantiate.rs
…
auto-ref-slice-plus-ref.rs
…
auto-ref-slice-plus-ref.stderr
…
autoderef-full-lval.rs
…
autoderef-full-lval.stderr
…
bare-fn-implements-fn-mut.rs
…
bare-static-string.rs
…
big-literals.rs
…
bind-by-move.rs
…
bitwise.rs
…
bogus-tag.rs
…
bogus-tag.stderr
…
borrow-by-val-method-receiver.rs
…
bounds-lifetime.rs
…
bounds-lifetime.stderr
…
break-diverging-value.rs
…
break-diverging-value.stderr
…
builtin-clone-unwind.rs
…
can-copy-pod.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
cancel-clean-via-immediate-rvalue-ref.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
cannot-mutate-captured-non-mut-var.rs
…
cannot-mutate-captured-non-mut-var.stderr
…
capture1.rs
…
capture1.stderr
…
catch-unwind-bang.rs
…
cenum_impl_drop_cast.rs
…
cenum_impl_drop_cast.stderr
…
cfguard-run.rs
…
char.rs
…
class-cast-to-trait.rs
…
class-cast-to-trait.stderr
…
class-method-missing.rs
…
class-method-missing.stderr
…
cleanup-rvalue-for-scope.rs
…
cleanup-rvalue-scopes-cf.rs
…
cleanup-rvalue-scopes-cf.stderr
…
cleanup-rvalue-scopes.rs
…
cleanup-rvalue-temp-during-incomplete-alloc.rs
tests: use needs-threads instead of ignore-emscripten
2025-01-23 20:51:29 +08:00
cleanup-shortcircuit.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
close-over-big-then-small-data.rs
…
command-line-diagnostics.rs
…
command-line-diagnostics.stderr
…
complex.rs
…
conservative_impl_trait.rs
…
conservative_impl_trait.stderr
…
constructor-lifetime-args.rs
…
constructor-lifetime-args.stderr
…
copy-a-resource.rs
…
copy-a-resource.stderr
…
crate-leading-sep.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
crate-method-reexport-grrrrrrr.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
crate-name-attr-used.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
crate-name-mismatch.rs
…
crate-name-mismatch.stderr
…
custom_attribute.rs
…
custom_attribute.stderr
…
custom-attribute-multisegment.rs
…
custom-attribute-multisegment.stderr
…
custom-test-frameworks-simple.rs
…
deduplicate-diagnostics.deduplicate.stderr
…
deduplicate-diagnostics.duplicate.stderr
…
deduplicate-diagnostics.rs
…
deep.rs
…
default-method-parsing.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
default-method-simple.rs
…
defaults-well-formedness.rs
…
deprecation-in-force-unstable.rs
…
deref-non-pointer.rs
…
deref-non-pointer.stderr
…
deref-rc.rs
…
deref.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
derive-uninhabited-enum-38885.rs
…
derive-uninhabited-enum-38885.stderr
…
destructure-trait-ref.rs
…
destructure-trait-ref.stderr
…
diverging-fallback-method-chain.rs
…
diverging-fallback-option.rs
…
diverging-fn-tail-35849.rs
…
diverging-fn-tail-35849.stderr
…
double-ref.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
double-type-import.rs
…
double-type-import.stderr
…
dupe-first-attr.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
duplicate_entry_error.rs
Remove the -test suffix from normalize directives
2024-12-27 19:58:16 +11:00
duplicate_entry_error.stderr
…
duplicate-label-E0381-issue-129274.rs
Deduplicate Spans in Uninitialized Check
2024-08-22 09:36:14 -07:00
duplicate-label-E0381-issue-129274.stderr
Deduplicate Spans in Uninitialized Check
2024-08-22 09:36:14 -07:00
early-ret-binop-add.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
elide-errors-on-mismatched-tuple.rs
…
elide-errors-on-mismatched-tuple.stderr
…
elided-test.rs
…
elided-test.stderr
…
else-if.rs
…
empty-allocation-non-null.rs
…
empty-allocation-rvalue-non-null.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
empty-type-parameter-list.rs
…
empty-type-parameter-list.stderr
…
error-festival.rs
…
error-festival.stderr
Suggest fixing typos and let bindings at the same time
2024-11-02 14:40:37 -07:00
error-should-say-copy-not-pod.rs
…
error-should-say-copy-not-pod.stderr
…
exclusive-drop-and-copy.rs
…
exclusive-drop-and-copy.stderr
…
explain.rs
…
explain.stdout
…
explicit-i-suffix.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
explore-issue-38412.rs
stability: remove skip_stability_check_due_to_privacy
2024-11-18 08:07:46 +01:00
explore-issue-38412.stderr
use backticks instead of single quotes when reporting "use of unstable library feature"
2024-11-03 13:55:52 -08:00
ext-expand-inner-exprs.rs
…
ext-nonexistent.rs
…
ext-nonexistent.stderr
…
fact.rs
…
fail-simple.rs
Tweak more warnings.
2024-10-28 14:20:28 +11:00
fail-simple.stderr
Tweak more warnings.
2024-10-28 14:20:28 +11:00
filter-block-view-items.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
format-no-std.rs
remove support for the #[start] attribute
2025-01-21 06:59:15 -07:00
fun-indirect-call.rs
…
future-incompatible-lint-group.rs
…
future-incompatible-lint-group.stderr
…
global-scope.rs
…
hello.rs
Update more 2024 tests to remove -Zunstable-options
2024-11-28 14:32:45 -08:00
illegal-ufcs-drop.fixed
…
illegal-ufcs-drop.rs
…
illegal-ufcs-drop.stderr
…
impl-inherent-non-conflict.rs
…
impl-not-adjacent-to-type.rs
…
impl-privacy-xc-1.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
impl-unused-rps-in-assoc-type.rs
…
impl-unused-rps-in-assoc-type.stderr
…
impl-unused-tps-inherent.rs
…
impl-unused-tps-inherent.stderr
…
impl-unused-tps.rs
stabilize -Znext-solver=coherence
2024-10-15 13:11:00 +02:00
impl-unused-tps.stderr
Do not project when there are unconstrained impl params
2025-01-03 05:01:14 +00:00
implicit-method-bind.rs
…
implicit-method-bind.stderr
…
inline-disallow-on-variant.rs
…
inline-disallow-on-variant.stderr
…
inlined-main.rs
…
inner-attrs-on-impl.rs
…
inner-module.rs
…
inner-static-type-parameter.rs
…
inner-static-type-parameter.stderr
…
inner-static.rs
…
integral-indexing.rs
…
integral-indexing.stderr
Trim output of E0277 in some cases
2024-11-02 03:08:04 +00:00
integral-variable-unification-error.rs
…
integral-variable-unification-error.stderr
…
invalid_crate_type_syntax.rs
…
invalid_crate_type_syntax.stderr
…
invalid_dispatch_from_dyn_impls.rs
…
invalid_dispatch_from_dyn_impls.stderr
Don't allow transmuting ZSTs in dispatch_from_dyn impl
2025-01-08 00:28:47 +00:00
issue-11881.rs
…
issue-13560.rs
…
issue-15924.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
issue-16822.rs
…
issue-18502.rs
…
issue-24106.rs
…
issue-76387-llvm-miscompile.rs
…
issues-71798.rs
…
issues-71798.stderr
…
item-name-overload.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
kinds-in-metadata.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
kinds-of-primitive-impl.rs
…
kinds-of-primitive-impl.stderr
…
last-use-in-block.rs
…
last-use-in-cap-clause.rs
…
last-use-is-capture.rs
…
lazy-and-or.rs
…
lexical-scopes.rs
…
lexical-scopes.stderr
…
lexical-scoping.rs
…
link-section.rs
Update tests for hidden references to mutable static
2024-09-13 14:10:56 +03:00
list.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
log-err-phi.rs
…
log-knows-the-names-of-variants.rs
…
log-poly.rs
…
logging-only-prints-once.rs
…
loud_ui.rs
…
max-min-classes.rs
…
maximal_mir_to_hir_coverage.rs
…
maybe-bounds.rs
…
maybe-bounds.stderr
Support ?Trait bounds in supertraits and dyn Trait under a feature gate
2024-07-25 20:53:33 +03:00
method-output-diff-issue-127263.rs
…
method-output-diff-issue-127263.stderr
…
minus-string.rs
…
minus-string.stderr
…
missing_debug_impls.rs
…
missing_debug_impls.stderr
…
mod-subitem-as-enum-variant.rs
…
mod-subitem-as-enum-variant.stderr
…
monomorphize-abi-alignment.rs
…
msvc-data-only.rs
…
msvc-opt-minsize.rs
…
multibyte.rs
…
multiline-comment.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
mut-function-arguments.rs
…
mutual-recursion-group.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
myriad-closures.rs
…
nested-block-comment.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
nested-cfg-attrs.rs
…
nested-cfg-attrs.stderr
…
nested-class.rs
…
nested-ty-params.rs
…
nested-ty-params.stderr
…
new-impl-syntax.rs
…
new-import-syntax.rs
…
new-style-constants.rs
…
new-unicode-escapes.rs
…
newlambdas.rs
…
newtype-polymorphic.rs
…
newtype.rs
…
no_crate_type.rs
…
no_crate_type.stderr
…
no_send-enum.rs
…
no_send-enum.stderr
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
no_send-rc.rs
…
no_send-rc.stderr
E0277: suggest dereferencing function arguments in more cases
2024-11-21 03:27:05 -08:00
no_share-enum.rs
…
no_share-enum.stderr
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
no_share-struct.rs
…
no_share-struct.stderr
…
no-capture-arc.rs
…
no-capture-arc.stderr
Remove CallKind::Deref hack from UseSpans
2025-01-06 03:55:19 +00:00
no-core-1.rs
…
no-core-2.rs
…
no-link-unknown-crate.rs
…
no-link-unknown-crate.stderr
…
no-reuse-move-arc.rs
…
no-reuse-move-arc.stderr
Remove CallKind::Deref hack from UseSpans
2025-01-06 03:55:19 +00:00
no-send-res-ports.rs
…
no-send-res-ports.stderr
Remove detail from label/note that is already available in other note
2024-10-29 16:26:57 +00:00
no-warn-on-field-replace-issue-34101.rs
…
noexporttypeexe.rs
…
noexporttypeexe.stderr
…
non-constant-expr-for-arr-len.rs
…
non-constant-expr-for-arr-len.stderr
…
non-copyable-void.rs
…
non-copyable-void.stderr
…
non-fmt-panic.fixed
…
non-fmt-panic.rs
…
non-fmt-panic.stderr
…
noncopyable-class.rs
…
noncopyable-class.stderr
…
nonscalar-cast.fixed
…
nonscalar-cast.rs
…
nonscalar-cast.stderr
…
not-clone-closure.rs
Add --diagnostic-width to some tests failing after 1a0c502183
2024-11-06 20:02:42 +01:00
not-clone-closure.stderr
Add --diagnostic-width to some tests failing after 1a0c502183
2024-11-06 20:02:42 +01:00
not-copy-closure.rs
…
not-copy-closure.stderr
Suggest borrowing arguments in generic positions when trait bounds are satisfied
2024-11-13 20:29:40 -08:00
not-enough-arguments.rs
…
not-enough-arguments.stderr
…
nul-characters.rs
…
nullable-pointer-iotareduction.rs
…
nullable-pointer-size.rs
…
object-pointer-types.rs
…
object-pointer-types.stderr
…
objects-coerce-freeze-borrored.rs
…
occurs-check-2.rs
…
occurs-check-2.stderr
…
occurs-check-3.rs
…
occurs-check-3.stderr
…
occurs-check.rs
…
occurs-check.stderr
…
once-cant-call-twice-on-heap.rs
…
once-cant-call-twice-on-heap.stderr
…
oom_unwind.rs
…
op-assign-builtins-by-ref.rs
…
opeq.rs
…
opt-in-copy.rs
…
opt-in-copy.stderr
…
optimization-remark.rs
…
out-pointer-aliasing.rs
…
output-slot-variants.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
over-constrained-vregs.rs
…
panic_implementation-closures.rs
…
panic-while-printing.rs
…
paren-span.rs
…
paren-span.stderr
…
partialeq_help.rs
…
partialeq_help.stderr
…
path-lookahead.fixed
…
path-lookahead.rs
…
path-lookahead.stderr
…
path.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
paths-containing-nul.rs
…
phantom-auto-trait.rs
…
phantom-auto-trait.stderr
Use trait name instead of full constraint in suggestion message
2024-12-07 21:29:58 +00:00
point-to-type-err-cause-on-impl-trait-return-2.rs
…
point-to-type-err-cause-on-impl-trait-return-2.stderr
…
pptypedef.rs
…
pptypedef.stderr
…
primitive-binop-lhs-mut.rs
…
print-calling-conventions.rs
Migrate run-make/print-calling-conventions to ui-test
2024-08-03 20:09:42 -04:00
print-calling-conventions.stdout
Add gpu-kernel calling convention
2025-01-16 00:26:55 +01:00
print-stdout-eprint-stderr.rs
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
2025-01-23 20:51:29 +08:00
project-cache-issue-31849.rs
…
ptr-coercion-rpass.rs
tests: remove //@ pretty-expanded usages
2024-11-26 02:50:48 +08:00
ptr-coercion.rs
…
ptr-coercion.stderr
…
query-visibility.rs
…
raw-str.rs
…
README.md
Fix typos on tests/ui/README.md
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realloc-16687.rs
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reassign-ref-mut.rs
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reexport-test-harness-main.rs
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resource-assign-is-not-copy.rs
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resource-destruct.rs
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rustc-error.rs
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seq-args.rs
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shadow-bool.rs
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short-error-format.rs
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short-error-format.stderr
On short error format, append primary span label to message
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simd-abi-checks-empty-list.rs
ABI checks: add support for tier2 arches
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simd-abi-checks-empty-list.stderr
show abi_unsupported_vector_types lint in future breakage reports
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simd-abi-checks-s390x.rs
Support s390x z13 vector ABI
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show abi_unsupported_vector_types lint in future breakage reports
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show abi_unsupported_vector_types lint in future breakage reports
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simd-abi-checks-s390x.z13_soft_float.stderr
show abi_unsupported_vector_types lint in future breakage reports
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simd-abi-checks.rs
add vector ABI check test for calling extern fn
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simd-abi-checks.stderr
add vector ABI check test for calling extern fn
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sized-borrowed-pointer.rs
tests: remove //@ pretty-expanded usages
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sized-cycle-note.rs
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sized-owned-pointer.rs
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sse2.rs
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sse-abi-checks.rs
ABI checks: add support for tier2 arches
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sse-abi-checks.stderr
show abi_unsupported_vector_types lint in future breakage reports
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stable-addr-of.rs
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std-uncopyable-atomics.rs
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stdio-is-blocking.rs
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
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string-box-error.rs
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struct-ctor-mangling.rs
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super-at-top-level.rs
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super.rs
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svh-add-nothing.rs
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swap-1.rs
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swap-overlapping.rs
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switched-expectations.rs
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syntax-extension-minor.rs
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tag-type-args.rs
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tag-variant-cast-non-nullary.fixed
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tag-variant-cast-non-nullary.rs
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tail-call-arg-leak.rs
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tail-cps.rs
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tail-typeck.rs
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tail-typeck.stderr
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trailing-comma.rs
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trait-method-number-parameters.rs
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transmute-equal-assoc-types.rs
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transmute-non-immediate-to-immediate.rs
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trivial_casts-rpass.rs
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try-from-int-error-partial-eq.rs
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try-operator-hygiene.rs
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try-operator.rs
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tydesc-name.rs
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type_length_limit.rs
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type_length_limit.stderr
normalize long-type.txt in tests
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type-id-higher-rank-2.rs
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type-namespace.rs
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type-param-constraints.rs
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type-param.rs
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type-ptr.rs
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type-use-i1-versus-i8.rs
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typeid-intrinsic.rs
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typestate-multi-decl.rs
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unconstrained-none.rs
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unconstrained-ref.rs
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underscore-ident-matcher.rs
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underscore-ident-matcher.stderr
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underscore-lifetimes.rs
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underscore-method-after-integer.rs
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unevaluated_fixed_size_array_len.rs
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uninit-empty-types.rs
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unit.rs
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unknown-llvm-arg.rs
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unnamed_argument_mode.rs
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unused-move.rs
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use-import-export.rs
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use-keyword-2.rs
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used.rs
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usize-generic-argument-parent.rs
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utf8_idents.rs
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utf8-bom.rs
Annotate input reference tests
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wait-forked-but-failed-child.rs
tests: use needs-subprocess instead of ignore-{wasm32,emscripten,sgx}
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write-fmt-errors.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>.

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