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Auto merge of #106458 - albertlarsan68:move-tests, r=jyn514
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Move src/test to the root

See MCP at rust-lang/compiler-team#573

There may be more changes needed.

The first commit is just the move of the files:
You can check that the first commit did not do anything else than renames by running
```
git diff --diff-filter=r -M100% <rust-lang remote>/master <first commit hash>
```
The output should be empty, because the filter excludes renames, and the match threshold for qualifying a rename is 100%.

The second one is mostly a "find and replace" of `src/test` to `tests` and whatever is needed to make CI pass.

What is left to do:
---

- [x] Move directory
- [ ] Change references to `src/test`
    - [x] Change references in-tree
    - [ ] Change references in submodules / out-of-tree docs
- [x] Make CI pass:
    - [x] Fix tidy
    - [x] Fix tests
    - [x] Bless tests if needed (shouldn't normally)
- [ ] Merge it !
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bors committed Jan 11, 2023
2 parents 8ecaad8 + 40ba0e8 commit b22c152
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4 changes: 2 additions & 2 deletions .github/workflows/ci.yml
Original file line number Diff line number Diff line change
Expand Up @@ -342,7 +342,7 @@ jobs:
os: macos-12-xl
- name: x86_64-apple-1
env:
SCRIPT: "./x.py --stage 2 test --exclude src/test/ui --exclude src/test/rustdoc --exclude src/test/run-make-fulldeps"
SCRIPT: "./x.py --stage 2 test --exclude tests/ui --exclude tests/rustdoc --exclude tests/run-make-fulldeps"
RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.8
Expand All @@ -353,7 +353,7 @@ jobs:
os: macos-12-xl
- name: x86_64-apple-2
env:
SCRIPT: "./x.py --stage 2 test src/test/ui src/test/rustdoc src/test/run-make-fulldeps"
SCRIPT: "./x.py --stage 2 test tests/ui tests/rustdoc tests/run-make-fulldeps"
RUST_CONFIGURE_ARGS: "--build=x86_64-apple-darwin --enable-sanitizers --enable-profiler --set rust.jemalloc --set llvm.ninja=false"
RUSTC_RETRY_LINKER_ON_SEGFAULT: 1
MACOSX_DEPLOYMENT_TARGET: 10.8
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4 changes: 2 additions & 2 deletions .gitignore
Original file line number Diff line number Diff line change
Expand Up @@ -26,7 +26,7 @@ Session.vim
.valgrindrc
.cargo
# Included because it is part of the test case
!/src/test/run-make/thumb-none-qemu/example/.cargo
!/tests/run-make/thumb-none-qemu/example/.cargo

## Configuration
/config.toml
Expand Down Expand Up @@ -74,6 +74,6 @@ package-lock.json
package.json

## Rustdoc GUI tests
src/test/rustdoc-gui/src/**.lock
tests/rustdoc-gui/src/**.lock

# Before adding new lines, see the comment at the top.
2 changes: 1 addition & 1 deletion Cargo.toml
Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,7 @@ exclude = [
"compiler/rustc_codegen_cranelift",
"compiler/rustc_codegen_gcc",
"src/bootstrap",
"src/test/rustdoc-gui",
"tests/rustdoc-gui",
# HACK(eddyb) This hardcodes the fact that our CI uses `/checkout/obj`.
"obj",
# The `x` binary is a thin wrapper that calls `x.py`, which initializes
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4 changes: 2 additions & 2 deletions compiler/rustc_ast_lowering/src/expr.rs
Original file line number Diff line number Diff line change
Expand Up @@ -689,8 +689,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
// call (like the identity function), as otherwise type and lifetime
// inference have a hard time figuring things out.
// Without this, we would get:
// E0720 in src/test/ui/impl-trait/in-trait/default-body-with-rpit.rs
// E0700 in src/test/ui/self/self_lifetime-async.rs
// E0720 in tests/ui/impl-trait/in-trait/default-body-with-rpit.rs
// E0700 in tests/ui/self/self_lifetime-async.rs

// `future::identity_future`:
let identity_future =
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/consumers.rs
Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ pub use super::{
/// can, for example, happen when requesting a body of a `const` function
/// because they are evaluated during typechecking. The panic can be avoided
/// by overriding the `mir_borrowck` query. You can find a complete example
/// that shows how to do this at `src/test/run-make/obtain-borrowck/`.
/// that shows how to do this at `tests/run-make/obtain-borrowck/`.
///
/// * Polonius is highly unstable, so expect regular changes in its signature or other details.
pub fn get_body_with_borrowck_facts(
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2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1737,7 +1737,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {

/// We check that there's a single level of block nesting to ensure always correct
/// suggestions. If we don't, then we only provide a free-form message to avoid
/// misleading users in cases like `src/test/ui/nll/borrowed-temporary-error.rs`.
/// misleading users in cases like `tests/ui/nll/borrowed-temporary-error.rs`.
/// We could expand the analysis to suggest hoising all of the relevant parts of
/// the users' code to make the code compile, but that could be too much.
struct NestedStatementVisitor {
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2 changes: 1 addition & 1 deletion compiler/rustc_borrowck/src/region_infer/opaque_types.rs
Original file line number Diff line number Diff line change
Expand Up @@ -262,7 +262,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
return self.tcx.ty_error();
}

// Only check this for TAIT. RPIT already supports `src/test/ui/impl-trait/nested-return-type2.rs`
// Only check this for TAIT. RPIT already supports `tests/ui/impl-trait/nested-return-type2.rs`
// on stable and we'd break that.
let OpaqueTyOrigin::TyAlias = origin else {
return definition_ty;
Expand Down
132 changes: 66 additions & 66 deletions compiler/rustc_codegen_cranelift/scripts/test_rustc_tests.sh
Original file line number Diff line number Diff line change
Expand Up @@ -10,118 +10,118 @@ pushd rust

command -v rg >/dev/null 2>&1 || cargo install ripgrep

rm -r src/test/ui/{extern/,unsized-locals/,lto/,linkage*} || true
for test in $(rg --files-with-matches "lto|// needs-asm-support|// needs-unwind" src/test/{ui,incremental}); do
rm -r tests/ui/{extern/,unsized-locals/,lto/,linkage*} || true
for test in $(rg --files-with-matches "lto|// needs-asm-support|// needs-unwind" tests/{ui,incremental}); do
rm $test
done

for test in $(rg -i --files-with-matches "//(\[\w+\])?~[^\|]*\s*ERR|// error-pattern:|// build-fail|// run-fail|-Cllvm-args" src/test/ui); do
for test in $(rg -i --files-with-matches "//(\[\w+\])?~[^\|]*\s*ERR|// error-pattern:|// build-fail|// run-fail|-Cllvm-args" tests/ui); do
rm $test
done

git checkout -- src/test/ui/issues/auxiliary/issue-3136-a.rs # contains //~ERROR, but shouldn't be removed
git checkout -- src/test/ui/proc-macro/pretty-print-hack/
git checkout -- tests/ui/issues/auxiliary/issue-3136-a.rs # contains //~ERROR, but shouldn't be removed
git checkout -- tests/ui/proc-macro/pretty-print-hack/

# missing features
# ================

# requires stack unwinding
rm src/test/incremental/change_crate_dep_kind.rs
rm src/test/incremental/issue-80691-bad-eval-cache.rs # -Cpanic=abort causes abort instead of exit(101)
rm tests/incremental/change_crate_dep_kind.rs
rm tests/incremental/issue-80691-bad-eval-cache.rs # -Cpanic=abort causes abort instead of exit(101)

# requires compiling with -Cpanic=unwind
rm -r src/test/ui/macros/rfc-2011-nicer-assert-messages/
rm -r src/test/run-make/test-benches
rm -r tests/ui/macros/rfc-2011-nicer-assert-messages/
rm -r tests/run-make/test-benches

# vendor intrinsics
rm src/test/ui/sse2.rs # cpuid not supported, so sse2 not detected
rm src/test/ui/intrinsics/const-eval-select-x86_64.rs # requires x86_64 vendor intrinsics
rm src/test/ui/simd/array-type.rs # "Index argument for `simd_insert` is not a constant"
rm src/test/ui/simd/intrinsic/generic-bitmask-pass.rs # simd_bitmask unimplemented
rm src/test/ui/simd/intrinsic/generic-as.rs # simd_as unimplemented
rm src/test/ui/simd/intrinsic/generic-arithmetic-saturating-pass.rs # simd_saturating_add unimplemented
rm src/test/ui/simd/intrinsic/float-math-pass.rs # simd_fcos unimplemented
rm src/test/ui/simd/intrinsic/generic-gather-pass.rs # simd_gather unimplemented
rm src/test/ui/simd/intrinsic/generic-select-pass.rs # simd_select_bitmask unimplemented
rm src/test/ui/simd/issue-85915-simd-ptrs.rs # simd_gather unimplemented
rm src/test/ui/simd/issue-89193.rs # simd_gather unimplemented
rm src/test/ui/simd/simd-bitmask.rs # simd_bitmask unimplemented
rm tests/ui/sse2.rs # cpuid not supported, so sse2 not detected
rm tests/ui/intrinsics/const-eval-select-x86_64.rs # requires x86_64 vendor intrinsics
rm tests/ui/simd/array-type.rs # "Index argument for `simd_insert` is not a constant"
rm tests/ui/simd/intrinsic/generic-bitmask-pass.rs # simd_bitmask unimplemented
rm tests/ui/simd/intrinsic/generic-as.rs # simd_as unimplemented
rm tests/ui/simd/intrinsic/generic-arithmetic-saturating-pass.rs # simd_saturating_add unimplemented
rm tests/ui/simd/intrinsic/float-math-pass.rs # simd_fcos unimplemented
rm tests/ui/simd/intrinsic/generic-gather-pass.rs # simd_gather unimplemented
rm tests/ui/simd/intrinsic/generic-select-pass.rs # simd_select_bitmask unimplemented
rm tests/ui/simd/issue-85915-simd-ptrs.rs # simd_gather unimplemented
rm tests/ui/simd/issue-89193.rs # simd_gather unimplemented
rm tests/ui/simd/simd-bitmask.rs # simd_bitmask unimplemented

# exotic linkages
rm src/test/ui/issues/issue-33992.rs # unsupported linkages
rm src/test/incremental/hashes/function_interfaces.rs # same
rm src/test/incremental/hashes/statics.rs # same
rm tests/ui/issues/issue-33992.rs # unsupported linkages
rm tests/incremental/hashes/function_interfaces.rs # same
rm tests/incremental/hashes/statics.rs # same

# variadic arguments
rm src/test/ui/abi/mir/mir_codegen_calls_variadic.rs # requires float varargs
rm src/test/ui/abi/variadic-ffi.rs # requires callee side vararg support
rm tests/ui/abi/mir/mir_codegen_calls_variadic.rs # requires float varargs
rm tests/ui/abi/variadic-ffi.rs # requires callee side vararg support

# unsized locals
rm -r src/test/run-pass-valgrind/unsized-locals
rm -r tests/run-pass-valgrind/unsized-locals

# misc unimplemented things
rm src/test/ui/intrinsics/intrinsic-nearby.rs # unimplemented nearbyintf32 and nearbyintf64 intrinsics
rm src/test/ui/target-feature/missing-plusminus.rs # error not implemented
rm src/test/ui/fn/dyn-fn-alignment.rs # wants a 256 byte alignment
rm -r src/test/run-make/emit-named-files # requires full --emit support
rm src/test/ui/abi/stack-probes.rs # stack probes not yet implemented
rm src/test/ui/simd/intrinsic/ptr-cast.rs # simd_expose_addr intrinsic unimplemented
rm -r src/test/run-make/repr128-dwarf # debuginfo test
rm src/test/codegen-units/item-collection/asm-sym.rs # requires support for sym in asm!()
rm tests/ui/intrinsics/intrinsic-nearby.rs # unimplemented nearbyintf32 and nearbyintf64 intrinsics
rm tests/ui/target-feature/missing-plusminus.rs # error not implemented
rm tests/ui/fn/dyn-fn-alignment.rs # wants a 256 byte alignment
rm -r tests/run-make/emit-named-files # requires full --emit support
rm tests/ui/abi/stack-probes.rs # stack probes not yet implemented
rm tests/ui/simd/intrinsic/ptr-cast.rs # simd_expose_addr intrinsic unimplemented
rm -r tests/run-make/repr128-dwarf # debuginfo test
rm tests/codegen-units/item-collection/asm-sym.rs # requires support for sym in asm!()

# optimization tests
# ==================
rm src/test/ui/codegen/issue-28950.rs # depends on stack size optimizations
rm src/test/ui/codegen/init-large-type.rs # same
rm src/test/ui/issues/issue-40883.rs # same
rm -r src/test/run-make/fmt-write-bloat/ # tests an optimization
rm tests/ui/codegen/issue-28950.rs # depends on stack size optimizations
rm tests/ui/codegen/init-large-type.rs # same
rm tests/ui/issues/issue-40883.rs # same
rm -r tests/run-make/fmt-write-bloat/ # tests an optimization

# backend specific tests
# ======================
rm src/test/incremental/thinlto/cgu_invalidated_when_import_{added,removed}.rs # requires LLVM
rm src/test/ui/abi/stack-protector.rs # requires stack protector support
rm tests/incremental/thinlto/cgu_invalidated_when_import_{added,removed}.rs # requires LLVM
rm tests/ui/abi/stack-protector.rs # requires stack protector support

# giving different but possibly correct results
# =============================================
rm src/test/ui/mir/mir_misc_casts.rs # depends on deduplication of constants
rm src/test/ui/mir/mir_raw_fat_ptr.rs # same
rm src/test/ui/consts/issue-33537.rs # same
rm src/test/ui/layout/valid_range_oob.rs # different ICE message
rm tests/ui/mir/mir_misc_casts.rs # depends on deduplication of constants
rm tests/ui/mir/mir_raw_fat_ptr.rs # same
rm tests/ui/consts/issue-33537.rs # same
rm tests/ui/layout/valid_range_oob.rs # different ICE message

# doesn't work due to the way the rustc test suite is invoked.
# should work when using ./x.py test the way it is intended
# ============================================================
rm -r src/test/run-make/emit-shared-files # requires the rustdoc executable in dist/bin/
rm -r src/test/run-make/unstable-flag-required # same
rm -r src/test/run-make/rustdoc-* # same
rm -r src/test/run-make/issue-88756-default-output # same
rm -r src/test/run-make/remap-path-prefix-dwarf # requires llvm-dwarfdump
rm -r src/test/ui/consts/missing_span_in_backtrace.rs # expects sysroot source to be elsewhere
rm -r tests/run-make/emit-shared-files # requires the rustdoc executable in dist/bin/
rm -r tests/run-make/unstable-flag-required # same
rm -r tests/run-make/rustdoc-* # same
rm -r tests/run-make/issue-88756-default-output # same
rm -r tests/run-make/remap-path-prefix-dwarf # requires llvm-dwarfdump
rm -r tests/ui/consts/missing_span_in_backtrace.rs # expects sysroot source to be elsewhere

# genuine bugs
# ============
rm src/test/incremental/spike-neg1.rs # errors out for some reason
rm src/test/incremental/spike-neg2.rs # same
rm src/test/ui/issues/issue-74564-if-expr-stack-overflow.rs # gives a stackoverflow before the backend runs
rm src/test/ui/mir/ssa-analysis-regression-50041.rs # produces ICE
rm src/test/ui/type-alias-impl-trait/assoc-projection-ice.rs # produces ICE
rm tests/incremental/spike-neg1.rs # errors out for some reason
rm tests/incremental/spike-neg2.rs # same
rm tests/ui/issues/issue-74564-if-expr-stack-overflow.rs # gives a stackoverflow before the backend runs
rm tests/ui/mir/ssa-analysis-regression-50041.rs # produces ICE
rm tests/ui/type-alias-impl-trait/assoc-projection-ice.rs # produces ICE

rm src/test/ui/simd/intrinsic/generic-reduction-pass.rs # simd_reduce_add_unordered doesn't accept an accumulator for integer vectors
rm tests/ui/simd/intrinsic/generic-reduction-pass.rs # simd_reduce_add_unordered doesn't accept an accumulator for integer vectors

rm src/test/ui/runtime/out-of-stack.rs # SIGSEGV instead of SIGABRT for some reason (#1301)
rm tests/ui/runtime/out-of-stack.rs # SIGSEGV instead of SIGABRT for some reason (#1301)

# bugs in the test suite
# ======================
rm src/test/ui/backtrace.rs # TODO warning
rm src/test/ui/simple_global_asm.rs # TODO add needs-asm-support
rm src/test/ui/test-attrs/test-type.rs # TODO panic message on stderr. correct stdout
rm tests/ui/backtrace.rs # TODO warning
rm tests/ui/simple_global_asm.rs # TODO add needs-asm-support
rm tests/ui/test-attrs/test-type.rs # TODO panic message on stderr. correct stdout
# not sure if this is actually a bug in the test suite, but the symbol list shows the function without leading _ for some reason
rm -r src/test/run-make/native-link-modifier-bundle
rm src/test/ui/process/nofile-limit.rs # TODO some AArch64 linking issue
rm src/test/ui/dyn-star/dispatch-on-pin-mut.rs # TODO failed assertion in vtable::get_ptr_and_method_ref
rm -r tests/run-make/native-link-modifier-bundle
rm tests/ui/process/nofile-limit.rs # TODO some AArch64 linking issue
rm tests/ui/dyn-star/dispatch-on-pin-mut.rs # TODO failed assertion in vtable::get_ptr_and_method_ref

rm src/test/ui/stdio-is-blocking.rs # really slow with unoptimized libstd
rm tests/ui/stdio-is-blocking.rs # really slow with unoptimized libstd

echo "[TEST] rustc test suite"
RUST_TEST_NOCAPTURE=1 COMPILETEST_FORCE_STAGE0=1 ./x.py test --stage 0 src/test/{codegen-units,run-make,run-pass-valgrind,ui,incremental}
RUST_TEST_NOCAPTURE=1 COMPILETEST_FORCE_STAGE0=1 ./x.py test --stage 0 tests/{codegen-units,run-make,run-pass-valgrind,ui,incremental}
popd
16 changes: 8 additions & 8 deletions compiler/rustc_codegen_gcc/test.sh
Original file line number Diff line number Diff line change
Expand Up @@ -253,25 +253,25 @@ rustc = "$HOME/.rustup/toolchains/$rust_toolchain-$TARGET_TRIPLE/bin/rustc"
EOF

rustc -V | cut -d' ' -f3 | tr -d '('
git checkout $(rustc -V | cut -d' ' -f3 | tr -d '(') src/test
git checkout $(rustc -V | cut -d' ' -f3 | tr -d '(') tests

for test in $(rg -i --files-with-matches "//(\[\w+\])?~|// error-pattern:|// build-fail|// run-fail|-Cllvm-args" src/test/ui); do
for test in $(rg -i --files-with-matches "//(\[\w+\])?~|// error-pattern:|// build-fail|// run-fail|-Cllvm-args" tests/ui); do
rm $test
done

git checkout -- src/test/ui/issues/auxiliary/issue-3136-a.rs # contains //~ERROR, but shouldn't be removed
git checkout -- tests/ui/issues/auxiliary/issue-3136-a.rs # contains //~ERROR, but shouldn't be removed

rm -r src/test/ui/{abi*,extern/,panic-runtime/,panics/,unsized-locals/,proc-macro/,threads-sendsync/,thinlto/,borrowck/,test*,*lto*.rs} || true
for test in $(rg --files-with-matches "catch_unwind|should_panic|thread|lto" src/test/ui); do
rm -r tests/ui/{abi*,extern/,panic-runtime/,panics/,unsized-locals/,proc-macro/,threads-sendsync/,thinlto/,borrowck/,test*,*lto*.rs} || true
for test in $(rg --files-with-matches "catch_unwind|should_panic|thread|lto" tests/ui); do
rm $test
done
git checkout src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice.rs
git checkout src/test/ui/type-alias-impl-trait/auxiliary/cross_crate_ice2.rs
git checkout tests/ui/type-alias-impl-trait/auxiliary/cross_crate_ice.rs
git checkout tests/ui/type-alias-impl-trait/auxiliary/cross_crate_ice2.rs

RUSTC_ARGS="-Zpanic-abort-tests -Csymbol-mangling-version=v0 -Zcodegen-backend="$(pwd)"/../target/"$CHANNEL"/librustc_codegen_gcc."$dylib_ext" --sysroot "$(pwd)"/../build_sysroot/sysroot -Cpanic=abort"

echo "[TEST] rustc test suite"
COMPILETEST_FORCE_STAGE0=1 ./x.py test --run always --stage 0 src/test/ui/ --rustc-args "$RUSTC_ARGS"
COMPILETEST_FORCE_STAGE0=1 ./x.py test --run always --stage 0 tests/ui/ --rustc-args "$RUSTC_ARGS"
}

function clean_ui_tests() {
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -95,7 +95,7 @@ impl<'tcx> Visitor<'tcx> for CheckLiveDrops<'_, 'tcx> {
}

// Drop elaboration is not precise enough to accept code like
// `src/test/ui/consts/control-flow/drop-pass.rs`; e.g., when an `Option<Vec<T>>` is
// `tests/ui/consts/control-flow/drop-pass.rs`; e.g., when an `Option<Vec<T>>` is
// initialized with `None` and never changed, it still emits drop glue.
// Hence we additionally check the qualifs here to allow more code to pass.
if self.qualifs.needs_non_const_drop(self.ccx, dropped_place.local, location) {
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_analysis/src/astconv/errors.rs
Original file line number Diff line number Diff line change
Expand Up @@ -267,7 +267,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
// segments, even though `trait_ref.path.segments` is of length `1`. Work
// around that bug here, even though it should be fixed elsewhere.
// This would otherwise cause an invalid suggestion. For an example, look at
// `src/test/ui/issues/issue-28344.rs` where instead of the following:
// `tests/ui/issues/issue-28344.rs` where instead of the following:
//
// error[E0191]: the value of the associated type `Output`
// (from trait `std::ops::BitXor`) must be specified
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_typeck/src/coercion.rs
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
//! useful for freezing mut things (that is, when the expected type is &T
//! but you have &mut T) and also for avoiding the linearity
//! of mut things (when the expected is &mut T and you have &mut T). See
//! the various `src/test/ui/coerce/*.rs` tests for
//! the various `tests/ui/coerce/*.rs` tests for
//! examples of where this is useful.
//!
//! ## Subtle note
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_typeck/src/demand.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1855,7 +1855,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let mut expectation = Some(expected_ty);
while let hir::ExprKind::MethodCall(_, rcvr, ..) = expr.kind {
// Getting to the root receiver and asserting it is a fn call let's us ignore cases in
// `src/test/ui/methods/issues/issue-90315.stderr`.
// `tests/ui/methods/issues/issue-90315.stderr`.
expr = rcvr;
// If we have more than one layer of calls, then the expected ty
// cannot guide the method probe.
Expand Down
2 changes: 1 addition & 1 deletion compiler/rustc_hir_typeck/src/fallback.rs
Original file line number Diff line number Diff line change
Expand Up @@ -308,7 +308,7 @@ impl<'tcx> FnCtxt<'_, 'tcx> {

if relationship.self_in_trait && relationship.output {
// This case falls back to () to ensure that the code pattern in
// src/test/ui/never_type/fallback-closure-ret.rs continues to
// tests/ui/never_type/fallback-closure-ret.rs continues to
// compile when never_type_fallback is enabled.
//
// This rule is not readily explainable from first principles,
Expand Down
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