Rename some more of our internal #[rustc_*] TEST attributes

[fmease]

Follow-up to #153300.

r? JonathanBrouwer or jdonszelmann

[rustbot]

The rustc-dev-guide subtree was changed. If this PR only touches the dev guide consider submitting a PR directly to rust-lang/rustc-dev-guide otherwise thank you for updating the dev guide with your changes.

cc @BoxyUwU, @tshepang

Some changes occurred in compiler/rustc_passes/src/check_attr.rs

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in compiler/rustc_hir/src/attrs

cc @jdonszelmann, @JonathanBrouwer

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

[rust-log-analyzer]

The job aarch64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Executing "/scripts/stage_2_test_set1.sh"
+ /scripts/stage_2_test_set1.sh
PR_CI_JOB set; skipping tidy
+ '[' 1 == 1 ']'
+ echo 'PR_CI_JOB set; skipping tidy'
+ SKIP_TIDY='--skip tidy'
+ ../x.py --stage 2 test --skip tidy --skip compiler --skip src
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
downloading https://static.rust-lang.org/dist/2026-03-05/rustfmt-nightly-aarch64-unknown-linux-gnu.tar.xz
---

10 LL | enum UninhabitedVariantSpace {
11    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
12 
- error: abi: ScalarPair(Initialized { value: Int(I8, false), valid_range: 0..=1 }, Initialized { value: Int(I8, false), valid_range: 0..=255 })
+ error: backend_repr: ScalarPair(Initialized { value: Int(I8, false), valid_range: 0..=1 }, Initialized { value: Int(I8, false), valid_range: 0..=255 })
14   --> $DIR/enum.rs:21:1
15    |
16 LL | enum ScalarPairDifferingSign {


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args layout/enum.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/layout/enum.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/layout/enum" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: align: AbiAlign { abi: Align(2 bytes) }
##[error]  --> /checkout/tests/ui/layout/enum.rs:9:1
   |
LL | enum UninhabitedVariantAlign { //~ERROR: backend_repr: Align(2 bytes)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: size: Size(16 bytes)
##[error]  --> /checkout/tests/ui/layout/enum.rs:15:1
   |
LL | enum UninhabitedVariantSpace { //~ERROR: size: Size(16 bytes)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: backend_repr: ScalarPair(Initialized { value: Int(I8, false), valid_range: 0..=1 }, Initialized { value: Int(I8, false), valid_range: 0..=255 })
##[error]  --> /checkout/tests/ui/layout/enum.rs:21:1
   |
LL | enum ScalarPairDifferingSign { //~ERROR: backend_repr: ScalarPair
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: size: Size(4 bytes)
##[error]  --> /checkout/tests/ui/layout/enum.rs:31:1
   |
LL | enum DefinedLayoutAllUninhabited { //~ERROR: size: Size(4 bytes)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 4 previous errors
------------------------------------------

---
- error: abi: Memory { sized: true }
+ error: backend_repr: Memory { sized: true }
2   --> $DIR/struct.rs:9:1
3    |
4 LL | struct AlignedZstPreventsScalar(i16, [i32; 0]);

5    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
6 
- error: abi: Scalar(Initialized { value: Int(I32, true), valid_range: 0..=4294967295 })
+ error: backend_repr: Scalar(Initialized { value: Int(I32, true), valid_range: 0..=4294967295 })
8   --> $DIR/struct.rs:12:1
9    |
10 LL | struct AlignedZstButStillScalar(i32, [i16; 0]);


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args layout/struct.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/layout/struct.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/layout/struct" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: backend_repr: Memory { sized: true }
##[error]  --> /checkout/tests/ui/layout/struct.rs:9:1
   |
LL | struct AlignedZstPreventsScalar(i16, [i32; 0]); //~ERROR: backend_repr: Memory
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: backend_repr: Scalar(Initialized { value: Int(I32, true), valid_range: 0..=4294967295 })
##[error]  --> /checkout/tests/ui/layout/struct.rs:12:1
   |
LL | struct AlignedZstButStillScalar(i32, [i16; 0]); //~ERROR: backend_repr: Scalar
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors
------------------------------------------