TypeId implements_trait

[coolcatcoder]

This is for #146922.

It allows checking if a TypeId implements a trait.

(I've never used git from the terminal before, so that was a fun challenge. I hope I did everything correctly.)
(I haven't added any tests yet, I'll do that soon.)
(Zulip.)

[rustbot]

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

The reflection data structures are tied exactly to the implementation
in the compiler. Make sure to also adjust rustc_const_eval/src/const_eval/type_info.rs

cc @oli-obk

Some changes occurred to the CTFE machinery

cc @RalfJung, @oli-obk, @lcnr

[rustbot]

r? @chenyukang

rustbot has assigned @chenyukang.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[coolcatcoder]

Also, because this pull request is pretty much just copying and pasting from vtable_for's implementation, should we de-duplicate the code by putting the implementation in one location that both intrinsics can call?

[xonx4l]

Also, because this pull request is pretty much just copying and pasting from vtable_for's implementation, should we de-duplicate the code by putting the implementation in one location that both intrinsics can call?

Sure , This way it's easier to maintain.

[rustbot]

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

[coolcatcoder]

I know I need to update the 32 bit dump, but I'm not sure how.
If required I could try get the test running on my gps, but I'm hopeful there is an easier way.

[oli-obk]

You can cross compile tests to a 32 bit target. For me "i686-unknown-linux-gnu" works

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[rustbot]

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in need_type_info.rs

cc @lcnr

HIR ty lowering was modified

cc @fmease

⚠️ #[rustc_allow_const_fn_unstable] needs careful audit to avoid accidentally exposing unstable
implementation details on stable.

cc @rust-lang/wg-const-eval

stdarch is developed in its own repository. If possible, consider making this change to rust-lang/stdarch instead.

cc @Amanieu, @folkertdev, @sayantn

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

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

cc @jdonszelmann, @JonathanBrouwer

Portable SIMD is developed in its own repository. If possible, consider making this change to rust-lang/portable-simd instead.

cc @calebzulawski, @programmerjake

This PR changes rustc_public

cc @oli-obk, @celinval, @ouz-a, @makai410

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, @jieyouxu, @Kobzol, @tshepang

rustc_macros::diagnostics was changed

cc @davidtwco, @TaKO8Ki, @JonathanBrouwer

Some changes occurred in compiler/rustc_hir/src/attrs

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred to constck

cc @fee1-dead

Some changes occurred in exhaustiveness checking

cc @Nadrieril

compiler-builtins is developed in its own repository. If possible, consider making this change to rust-lang/compiler-builtins instead.

cc @tgross35

changes to the core type system

cc @lcnr

[coolcatcoder]

Oh goodness, by loading the backup, it thinks I've changed every file in rust.
I'm so sorry for the noise!

[coolcatcoder]

Perhaps I should abandon this pull request...
I can write the code for it, but I just can't manage git.
Every attempt I make to learn, and to fix my mistakes, it always ends poorly.

[rust-log-analyzer]

The job aarch64-gnu-llvm-20-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

test [ui] tests/ui/asm/aarch64/may_unwind.rs ... ok
test [ui] tests/ui/asm/aarch64/type-check-2.rs ... ok
test [ui] tests/ui/asm/aarch64/type-check-3.rs ... ok
test [ui] tests/ui/asm/aarch64/type-f16.rs ... ok
test [ui] tests/ui/asm/aarch64v8r.rs#sf ... ok
test [ui] tests/ui/asm/aarch64v8r.rs#hf ... ok
test [ui] tests/ui/asm/arm-low-dreg.rs ... ok
test [ui] tests/ui/asm/bad-template.rs#aarch64 ... ok
test [ui] tests/ui/asm/binary_asm_labels.rs ... ignored, only executed when the architecture is x86_64
test [ui] tests/ui/asm/aarch64/sym.rs ... ok
test [ui] tests/ui/asm/asm-with-nested-closure.rs ... ok
---
test [ui] tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs#thin0 ... ok
test [ui] tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs#fat3 ... ok
test [ui] tests/ui/extern/issue-80074.rs ... ok
test [ui] tests/ui/extern/issue-95829.rs ... ok
test [ui] tests/ui/extern/lgamma-linkage.rs ... ok
test [ui] tests/ui/extern/no-mangle-associated-fn.rs ... ok
test [ui] tests/ui/extern/not-in-block.rs ... ok
test [ui] tests/ui/extern/unsized-extern-derefmove.rs ... ok
test [ui] tests/ui/extern/windows-tcb-trash-13259.rs ... ok
test [ui] tests/ui/feature-gates/allow-features-empty.rs ... ok
---
test [ui] tests/ui/imports/ambiguous-4.rs ... ok
test [ui] tests/ui/imports/ambiguous-9.rs ... ok
test [ui] tests/ui/imports/ambiguous-panic-glob-vs-multiouter.rs ... ok
test [ui] tests/ui/imports/ambiguous-panic-no-implicit-prelude.rs ... ok
test [ui] tests/ui/imports/ambiguous-panic-globvsglob.rs ... ok
test [ui] tests/ui/imports/ambiguous-8.rs ... ok
test [ui] tests/ui/imports/ambiguous-glob-vs-expanded-extern.rs ... ok
test [ui] tests/ui/imports/ambiguous-panic-non-prelude-std-glob.rs ... ok
test [ui] tests/ui/imports/ambiguous-panic-non-prelude-core-glob.rs ... ok
test [ui] tests/ui/imports/ambiguous-panic-pick-std.rs ... ok
---
- error[E0507]: cannot move out of `y`, a captured variable in an `AsyncFn` closure
+ error[E0507]: cannot move out of `y` which is behind a shared reference
2   --> $DIR/move-from-async-fn-bound.rs:9:10
3    |
- LL |     let y = vec![format!("World")];
-    |         - captured outer variable
6 LL |     call(async || {
-    |          ^^^^^^^^
-    |          |
-    |          captured by this `AsyncFn` closure
-    |          `y` is moved here
+    |          ^^^^^^^^ `y` is moved here
11 LL |
12 LL |         y.into_iter();
13    |         -

15    |         variable moved due to use in coroutine
16    |         move occurs because `y` has type `Vec<String>`, which does not implement the `Copy` trait
17    |
- help: `AsyncFn` and `AsyncFnMut` closures require captured values to be able to be consumed multiple times, but `AsyncFnOnce` closures may consume them only once
-   --> $DIR/move-from-async-fn-bound.rs:5:27
-    |
- LL | fn call<F>(_: F) where F: AsyncFn() {}
-    |                           ^^^^^^^^^
23 help: consider cloning the value if the performance cost is acceptable
24    |
25 LL |         y.clone().into_iter();


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 async-await/async-closures/move-from-async-fn-bound.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/async-await/async-closures/move-from-async-fn-bound.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/async-await/async-closures/move-from-async-fn-bound" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2021"
stdout: none
--- stderr -------------------------------
error[E0507]: cannot move out of `y` which is behind a shared reference
##[error]  --> /checkout/tests/ui/async-await/async-closures/move-from-async-fn-bound.rs:9:10
   |
LL |     call(async || {
   |          ^^^^^^^^ `y` is moved here
LL |         //~^ ERROR cannot move out of `y`, a captured variable in an `AsyncFn` closure
LL |         y.into_iter();
   |         -
   |         |
   |         variable moved due to use in coroutine
   |         move occurs because `y` has type `Vec<String>`, which does not implement the `Copy` trait
   |
help: consider cloning the value if the performance cost is acceptable
   |
LL |         y.clone().into_iter();
   |          ++++++++
---
error: ui test did not emit an error
note: by default, ui tests are expected not to compile.
hint: use check-pass, build-pass, or run-pass directive to change this behavior.
status: exit status: 0
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/coercion/closure-in-array.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/coercion/closure-in-array" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: none

---- [ui] tests/ui/coercion/closure-in-array.rs stdout end ----
---- [ui] tests/ui/coercion/coerce-many-with-ty-var.rs stdout ----

error: test compilation failed although it shouldn't!
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/coercion/coerce-many-with-ty-var.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)" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/coercion/coerce-many-with-ty-var/a" "-A" "internal_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[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/coercion/coerce-many-with-ty-var.rs:14:21
   |
LL |     let _: [_; 2] = [foo, bar];
   |            ------   ^^^^^^^^^^ expected `[fn() {foo}; 2]`, found `[fn(); 2]`
   |            |
   |            expected due to this
   |
   = note: expected array `[fn() {foo}; 2]`
              found array `[fn(); 2]`
   = help: consider casting the fn item to a fn pointer: `foo as fn()`

error[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/coercion/coerce-many-with-ty-var.rs:15:25
   |
LL |     infer_array_element([foo, bar]);
   |     ------------------- ^^^^^^^^^^ expected `[fn() {foo}; 2]`, found `[fn(); 2]`
   |     |
   |     arguments to this function are incorrect
   |
   = note: expected array `[fn() {foo}; 2]`
              found array `[fn(); 2]`
   = help: consider casting the fn item to a fn pointer: `foo as fn()`
note: function defined here
  --> /checkout/tests/ui/coercion/coerce-many-with-ty-var.rs:10:4
   |
LL | fn infer_array_element<T>(_: [T; 2]) {}
   |    ^^^^^^^^^^^^^^^^^^^    ---------

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.
---
error: ui test did not emit an error
note: by default, ui tests are expected not to compile.
hint: use check-pass, build-pass, or run-pass directive to change this behavior.
status: exit status: 0
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/frontmatter/content-cr.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/frontmatter/content-cr" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: none

---- [ui] tests/ui/frontmatter/content-cr.rs stdout end ----
---- [ui] tests/ui/hygiene/unpretty-debug-lifetimes.rs stdout ----
Saved the actual stdout to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/hygiene/unpretty-debug-lifetimes/unpretty-debug-lifetimes.stdout`
diff of stdout:

17     */ {
18     ($f:ident<$a:lifetime>) => { fn $f<$a, 'a>() {} }
19 }
- fn f /* 0#0 */<'a /* 0#0 */, 'a /* 0#1 */>() {}
+ fn f /* 0#0 */<'a /* 3026 */, 'a /* 3026 */>() {}
21 
22 
23 /*

Note: some mismatched output was normalized before being compared
- fn f /* 920#0 */<'a /* 3026 */, 'a /* 3026 */>() {}
+ fn f /* 0#0 */<'a /* 3026 */, 'a /* 3026 */>() {}


The actual stdout differed from the expected stdout
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args hygiene/unpretty-debug-lifetimes.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
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/hygiene/unpretty-debug-lifetimes.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/hygiene/unpretty-debug-lifetimes" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Zunpretty=expanded,hygiene"
--- stdout -------------------------------
//@ check-pass
//@ compile-flags: -Zunpretty=expanded,hygiene

// Regression test for lifetime hygiene annotations in -Zunpretty=expanded,hygiene
// Previously, lifetimes were missing the #N syntax context suffix.

// Don't break whenever Symbol numbering changes
//@ normalize-stdout: "\d+#" -> "0#"

#![feature /* 976#0 */(decl_macro)]
#![feature /* 976#0 */(no_core)]
#![no_core /* 1479#0 */]

macro lifetime_hygiene
    /*
    3025#0
    */ {
    ($f:ident<$a:lifetime>) => { fn $f<$a, 'a>() {} }
}
fn f /* 920#0 */<'a /* 3026 */, 'a /* 3026 */>() {}


/*
Expansions:
crate0::{{expn0}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Root
crate0::{{expn1}}: parent: crate0::{{expn0}}, call_site_ctxt: #0, def_site_ctxt: #0, kind: Macro(Bang, "lifetime_hygiene")

SyntaxContexts:
#0: parent: #0, outer_mark: (crate0::{{expn0}}, Opaque)
#1: parent: #0, outer_mark: (crate0::{{expn1}}, Opaque)
*/
------------------------------------------
stderr: none

---- [ui] tests/ui/hygiene/unpretty-debug-lifetimes.rs stdout end ----
---- [ui] tests/ui/imports/ambiguous-reachable.rs stdout ----

error: test compilation failed although it shouldn't!
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/imports/ambiguous-reachable.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" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/imports/ambiguous-reachable" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/imports/ambiguous-reachable/auxiliary" "--extern" "ambiguous_reachable_extern=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/imports/ambiguous-reachable/auxiliary/libambiguous_reachable_extern.so"
stdout: none
--- stderr -------------------------------
error: missing optimized MIR for `ambiguous_reachable_extern::m1::generic::<u8>` in the crate `ambiguous_reachable_extern`
   |
note: missing optimized MIR for this item (was the crate `ambiguous_reachable_extern` compiled with `--emit=metadata`?)
  --> /checkout/tests/ui/imports/auxiliary/ambiguous-reachable-extern.rs:2:5
   |
LL |     pub fn generic<T>() {
   |     ^^^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error
---
To only update this specific test, also pass `--test-args let-else/let-else-break-help-issue-142602.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/let-else/let-else-break-help-issue-142602.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/let-else/let-else-break-help-issue-142602" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/let-else/let-else-break-help-issue-142602.rs:10:19
   |
LL |             break 3; //~ ERROR mismatched types
   |                   ^ expected `()`, found integer

error[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/let-else/let-else-break-help-issue-142602.rs:20:19
   |
LL |             break 3; //~ ERROR mismatched types
   |                   ^ expected `()`, found integer

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.
------------------------------------------

---- [ui] tests/ui/let-else/let-else-break-help-issue-142602.rs stdout end ----
---- [ui] tests/ui/lint/unused-parens-labeled-break-issue-143256.rs stdout ----

error: test compilation failed although it shouldn't!
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/lint/unused-parens-labeled-break-issue-143256.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/lint/unused-parens-labeled-break-issue-143256" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: unnecessary parentheses around `if` condition
##[error]  --> /checkout/tests/ui/lint/unused-parens-labeled-break-issue-143256.rs:12:16
   |
LL |             if (break 'outer i) {
   |                ^              ^
   |
note: the lint level is defined here
  --> /checkout/tests/ui/lint/unused-parens-labeled-break-issue-143256.rs:4:9
   |
LL | #![deny(unused_parens)]
   |         ^^^^^^^^^^^^^
help: remove these parentheses
   |
LL -             if (break 'outer i) {
LL +             if break 'outer i {
   |

error: aborting due to 1 previous error
------------------------------------------

---
13 help: use `let _ = ...` to ignore the resulting value
14    |
- LL |         let _ = error();
-    |         +++++++
+ LL |     let _ = let _ = foo!();
+    |             +++++++
17 
18 error: aborting due to 1 previous error
19 

Note: some mismatched output was normalized before being compared
- LL |     let _ = let _ = foo!(); //~ ERROR unused `Result` that must be used
+ LL |     let _ = let _ = foo!();
+    |             +++++++


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 lint/unused/lint-unsed-in-macro-issue-151269.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/lint/unused/lint-unsed-in-macro-issue-151269.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/lint/unused/lint-unsed-in-macro-issue-151269" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: unused `Result` that must be used
##[error]  --> /checkout/tests/ui/lint/unused/lint-unsed-in-macro-issue-151269.rs:14:13
   |
LL |     let _ = foo!(); //~ ERROR unused `Result` that must be used
   |             ^^^^^^
   |
   = note: this `Result` may be an `Err` variant, which should be handled
note: the lint level is defined here
  --> /checkout/tests/ui/lint/unused/lint-unsed-in-macro-issue-151269.rs:1:9
   |
LL | #![deny(unused_must_use)]
   |         ^^^^^^^^^^^^^^^
help: use `let _ = ...` to ignore the resulting value
   |
LL |     let _ = let _ = foo!(); //~ ERROR unused `Result` that must be used
   |             +++++++

error: aborting due to 1 previous error
------------------------------------------

---- [ui] tests/ui/lint/unused/lint-unsed-in-macro-issue-151269.rs stdout end ----
---- [ui] tests/ui/lint/unused/unused-allocation-box-ref-issue-151846.rs stdout ----

error: test compilation failed although it shouldn't!
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/lint/unused/unused-allocation-box-ref-issue-151846.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/lint/unused/unused-allocation-box-ref-issue-151846" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: unnecessary allocation, use `&` instead
##[error]  --> /checkout/tests/ui/lint/unused/unused-allocation-box-ref-issue-151846.rs:40:5
   |
LL |     Box::new(MyStruct).trait_takes_box_ref();
   |     ^^^^^^^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> /checkout/tests/ui/lint/unused/unused-allocation-box-ref-issue-151846.rs:5:9
   |
LL | #![deny(unused_allocation)]
   |         ^^^^^^^^^^^^^^^^^

error: unnecessary allocation, use `&` instead
##[error]  --> /checkout/tests/ui/lint/unused/unused-allocation-box-ref-issue-151846.rs:41:5
   |
LL |     Box::new(MyStruct).inherent_takes_box_ref();
   |     ^^^^^^^^^^^^^^^^^^

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

---
- error: aborting due to 1 previous error
+ error[E0308]: mismatched types
+   --> $DIR/missing-let.rs:4:12
+    |
+ LL |         && Some(x) = x
+    |            ^^^^^^^ expected `bool`, found `Option<Option<{integer}>>`
+    |
+    = note: expected type `bool`
+               found enum `Option<Option<{integer}>>`
+ help: use `Option::is_some` to test if the `Option` has a value
+    |
+ LL |         && Some(x).is_some() = x
+    |                   ++++++++++
18 
+ error[E0308]: mismatched types
+   --> $DIR/missing-let.rs:3:8
+    |
---
19 

Note: some mismatched output was normalized before being compared
-   --> /checkout/tests/ui/missing/missing-let.rs:4:12
- LL |         && Some(x) = x //~^ ERROR expected expression, found `let` statement
- LL |         && Some(x).is_some() = x //~^ ERROR expected expression, found `let` statement
-   --> /checkout/tests/ui/missing/missing-let.rs:3:8
- LL | |         && Some(x) = x //~^ ERROR expected expression, found `let` statement
+ error[E0308]: mismatched types
+   --> $DIR/missing-let.rs:4:12
+    |
+ LL |         && Some(x) = x
+    |            ^^^^^^^ expected `bool`, found `Option<Option<{integer}>>`
+    |
+    = note: expected type `bool`
+               found enum `Option<Option<{integer}>>`
+ help: use `Option::is_some` to test if the `Option` has a value
+    |
+ LL |         && Some(x).is_some() = x
+    |                   ++++++++++
+ error[E0308]: mismatched types
+   --> $DIR/missing-let.rs:3:8
+    |
+ LL |       if let Some(_) = x
---
To only update this specific test, also pass `--test-args missing/missing-let.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/missing/missing-let.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/missing/missing-let" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: expected expression, found `let` statement
##[error]  --> /checkout/tests/ui/missing/missing-let.rs:3:8
   |
LL |     if let Some(_) = x
   |        ^^^^^^^^^^^^^^^
   |
   = note: only supported directly in conditions of `if` and `while` expressions
help: you might have meant to continue the let-chain
   |
LL |         && let Some(x) = x //~^ ERROR expected expression, found `let` statement
   |            +++
help: you might have meant to compare for equality
   |
LL |         && Some(x) == x //~^ ERROR expected expression, found `let` statement
   |                     +

error[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/missing/missing-let.rs:4:12
   |
LL |         && Some(x) = x //~^ ERROR expected expression, found `let` statement
   |            ^^^^^^^ expected `bool`, found `Option<Option<{integer}>>`
   |
   = note: expected type `bool`
              found enum `Option<Option<{integer}>>`
help: use `Option::is_some` to test if the `Option` has a value
   |
LL |         && Some(x).is_some() = x //~^ ERROR expected expression, found `let` statement
   |                   ++++++++++

error[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/missing/missing-let.rs:3:8
   |
LL |       if let Some(_) = x
   |  ________^
LL | |         && Some(x) = x //~^ ERROR expected expression, found `let` statement
   | |______________________^ expected `bool`, found `()`

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0308`.
------------------------------------------

---- [ui] tests/ui/missing/missing-let.rs stdout end ----
---- [ui] tests/ui/suggestions/derive-clone-already-present-issue-146515.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/suggestions/derive-clone-already-present-issue-146515/derive-clone-already-present-issue-146515.stderr`
diff of stderr:

15 LL |     x.clone()
16    |     ^
17    = help: `Clone` is not implemented because the trait bound `T: Clone` is not satisfied
---
To only update this specific test, also pass `--test-args suggestions/derive-clone-already-present-issue-146515.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/suggestions/derive-clone-already-present-issue-146515.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/suggestions/derive-clone-already-present-issue-146515" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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[E0308]: mismatched types
##[error]  --> /checkout/tests/ui/suggestions/derive-clone-already-present-issue-146515.rs:12:5
   |
LL | fn clone_me<T>(x: &ContainsRc<T>) -> ContainsRc<T> {
   |                                      ------------- expected `ContainsRc<T>` because of return type
LL |     //~^ NOTE expected `ContainsRc<T>` because of return type
LL |     x.clone()
   |     ^^^^^^^^^ expected `ContainsRc<T>`, found `&ContainsRc<T>`
   |
   = note: expected struct `ContainsRc<_>`
           found reference `&ContainsRc<_>`
note: `ContainsRc<T>` does not implement `Clone`, so `&ContainsRc<T>` was cloned instead
  --> /checkout/tests/ui/suggestions/derive-clone-already-present-issue-146515.rs:12:5
   |
LL |     x.clone()
   |     ^
   = help: `Clone` is not implemented because the trait bound `T: Clone` is not satisfied
help: consider annotating `ContainsRc<T>` with `#[derive(Clone)]`
---

2   --> $DIR/associated-item-unsatisfied-trait-bounds.rs:8:10
3    |
4 LL | struct Foo;
-    | ---------- function or associated item `bat` not found for this struct because `Foo` doesn't implement `Bar` or `Baz`
+    | ---------- function or associated item `bat` not found for this struct because it doesn't satisfy `Foo: Bar`, `Foo: Bat` or `Foo: Baz`
6 ...
7 LL |     Foo::bat(());
8    |          ^^^ function or associated item cannot be called on `Foo` due to unsatisfied trait bounds

9    |
- note: for `bat` to be available, `Foo` must implement `Bar` and `Baz`
+ note: the following trait bounds were not satisfied:
+       `&Foo: Bar`
+       `&Foo: Baz`
+       `&mut Foo: Bar`
+       `&mut Foo: Baz`
+       `Foo: Bar`
+       `Foo: Baz`
11   --> $DIR/associated-item-unsatisfied-trait-bounds.rs:5:38
12    |
13 LL | impl<T> Bat for T where T: 'static + Bar + Baz { fn bat(&self) { println!("generic bat"); } }


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 traits/associated-item-unsatisfied-trait-bounds.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/traits/associated-item-unsatisfied-trait-bounds.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/traits/associated-item-unsatisfied-trait-bounds" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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[E0599]: the function or associated item `bat` exists for struct `Foo`, but its trait bounds were not satisfied
##[error]  --> /checkout/tests/ui/traits/associated-item-unsatisfied-trait-bounds.rs:8:10
   |
LL | struct Foo;
   | ---------- function or associated item `bat` not found for this struct because it doesn't satisfy `Foo: Bar`, `Foo: Bat` or `Foo: Baz`
...
LL |     Foo::bat(()); //~ ERROR E0599
   |          ^^^ function or associated item cannot be called on `Foo` due to unsatisfied trait bounds
   |
note: the following trait bounds were not satisfied:
      `&Foo: Bar`
      `&Foo: Baz`
      `&mut Foo: Bar`
      `&mut Foo: Baz`
      `Foo: Bar`
      `Foo: Baz`
  --> /checkout/tests/ui/traits/associated-item-unsatisfied-trait-bounds.rs:5:38
   |
LL | impl<T> Bat for T where T: 'static + Bar + Baz { fn bat(&self) { println!("generic bat"); } }
   |         ---     -                    ^^^   ^^^ unsatisfied trait bound introduced here
   |                                      |
   |                                      unsatisfied trait bound introduced here
note: the traits `Bar` and `Baz` must be implemented
  --> /checkout/tests/ui/traits/associated-item-unsatisfied-trait-bounds.rs:2:1
   |
LL | trait Bar {}
   | ^^^^^^^^^
LL | trait Baz {}
   | ^^^^^^^^^
   = help: items from traits can only be used if the trait is implemented and in scope
note: `Bat` defines an item `bat`, perhaps you need to implement it
  --> /checkout/tests/ui/traits/associated-item-unsatisfied-trait-bounds.rs:4:1
   |
LL | trait Bat { fn bat(&self); }
   | ^^^^^^^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.
---
+ 
+ error: cannot find attribute `rustc_non_const_trait_method` in this scope
+   --> $DIR/attr-gate.rs:2:7
6    |
-    = help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
-    = note: the `#[rustc_non_const_trait_method]` attribute is an internal implementation detail that will never be stable
-    = note: `#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods as non-const to allow large traits an easier transition to const
+ LL |     #[rustc_non_const_trait_method]
+    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
10 
- error: aborting due to 1 previous error
+ error: aborting due to 2 previous errors
12 
---
To only update this specific test, also pass `--test-args traits/const-traits/partial/attr-gate.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/traits/const-traits/partial/attr-gate.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/traits/const-traits/partial/attr-gate" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: attributes starting with `rustc` are reserved for use by the `rustc` compiler
##[error]  --> /checkout/tests/ui/traits/const-traits/partial/attr-gate.rs:2:7
   |
---
-    = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
+ LL |     #[rustc_non_const_trait_method]
+    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
10 
- error[E0015]: cannot call non-const associated function `<T as A>::b` in constant functions
-   --> $DIR/no-const-callers.rs:26:5
+ error: cannot find attribute `rustc_non_const_trait_method` in this scope
+   --> $DIR/no-const-callers.rs:5:7
13    |
- LL |     T::b();
-    |     ^^^^^^
-    |
-    = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
+ LL |     #[rustc_non_const_trait_method]
+    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
18 
- error[E0015]: cannot call non-const associated function `<() as A>::b` in constant functions
-   --> $DIR/no-const-callers.rs:29:5
+ error[E0015]: cannot call non-const function `std::io::_print` in constant functions
+   --> $DIR/no-const-callers.rs:6:14
21    |
- LL |     <()>::b();
-    |     ^^^^^^^^^
+ LL |     fn b() { println!("hi"); }
+    |              ^^^^^^^^^^^^^^
24    |
+ note: function `_print` is not const
+   --> $SRC_DIR/std/src/io/stdio.rs:LL:COL
25    = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
26 
- error[E0015]: cannot call non-const associated function `<u8 as A>::b` in constant functions
-   --> $DIR/no-const-callers.rs:32:5
+ error[E0015]: cannot call non-const function `std::io::_print` in constant functions
+   --> $DIR/no-const-callers.rs:15:14
29    |
- LL |     u8::b();
---
+ note: function `_print` is not const
+   --> $SRC_DIR/std/src/io/stdio.rs:LL:COL
33    = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
34 
- error[E0015]: cannot call non-const associated function `<i8 as A>::b` in constant functions
-   --> $DIR/no-const-callers.rs:35:5
-    |
- LL |     i8::b();
-    |     ^^^^^^^
-    |
---
+ LL |     #[rustc_non_const_trait_method]
+    |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ error[E0015]: cannot call non-const function `std::io::_print` in constant functions
+   --> $DIR/no-const-callers.rs:6:14
+ LL |     fn b() { println!("hi"); }
+    |              ^^^^^^^^^^^^^^
+ note: function `_print` is not const
+   --> $SRC_DIR/std/src/io/stdio.rs:LL:COL
+ error[E0015]: cannot call non-const function `std::io::_print` in constant functions
+   --> $DIR/no-const-callers.rs:15:14
---
To only update this specific test, also pass `--test-args traits/const-traits/partial/no-const-callers.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/traits/const-traits/partial/no-const-callers.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/traits/const-traits/partial/no-const-callers" "-A" "unused" "-W" "unused_attributes" "-A" "internal_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: attributes starting with `rustc` are reserved for use by the `rustc` compiler
##[error]  --> /checkout/tests/ui/traits/const-traits/partial/no-const-callers.rs:5:7
   |
---

error[E0015]: cannot call non-const function `std::io::_print` in constant functions
##[error]  --> /checkout/tests/ui/traits/const-traits/partial/no-const-callers.rs:6:14
   |
LL |     fn b() { println!("hi"); }
   |              ^^^^^^^^^^^^^^
   |
note: function `_print` is not const
  --> /rustc/FAKE_PREFIX/library/std/src/io/stdio.rs:1274:0
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants

[RalfJung]

See https://rustc-dev-guide.rust-lang.org/git.html#rebasing for some help with rebasing.

[coolcatcoder]

Anyone can feel free to try to recover this pull request.
Saving it is beyond my skill level at this point.
I'm just going to create a new branch, and start from the beginning, for what I believe is the third time.

[Kobzol]

Yeah, probably best to start over.

Next time, if you need to rebase over main, you can do something like this:

git fetch origin
git rebase origin/main

assuming that origin is the name of the remote that points to github.com/rust-lang/rust (you can check with git remote -v).

[rust-bors]

☔ The latest upstream changes (presumably #151820) made this pull request unmergeable. Please resolve the merge conflicts.

[9SonSteroids]

Hey, I ported your code to support getting the vtable and it works! @coolcatcoder