Make broken MIR a proper lint.

[cjgillot]

This allows to use expect(rustc::broken_mir) when we actually expect it to fire.

cc @tmiasko

@matthiaskrgr this should address #119077 (comment)

[rustbot]

r? @TaKO8Ki

(rustbot has picked a reviewer for you, use r? to override)

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[compiler-errors]

Forbid maybe?

[tmiasko]

Bike-shedding: The term broken MIR is already used when validation fails. It also overstates the severity of what is being reported. Maybe unusual MIR?

[compiler-errors]

I do believe broken is the right term here

[bors]

☔ The latest upstream changes (presumably #119377) made this pull request unmergeable. Please resolve the merge conflicts.

[rust-log-analyzer]

The job x86_64-gnu-llvm-16 failed! Check out the build log: (web) (plain)

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

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GITHUB_WORKSPACE=/home/runner/work/rust/rust
GOROOT_1_19_X64=/opt/hostedtoolcache/go/1.19.13/x64
---
Built container sha256:9c3c93a371e5aed5c18185b24f130d95d5140dbd72a9b325e7b6b49e521a4faa
Looks like docker image is the same as before, not uploading
https://ci-caches.rust-lang.org/docker/7ebc15c01a233894034d277c8cce4e949f4e7791f66b4727c8fb6e058a0b8171d6152e1441d677cef0653843ceeee469c097b8699b2bb74249e674f6aa1a8813
sha256:9c3c93a371e5aed5c18185b24f130d95d5140dbd72a9b325e7b6b49e521a4faa
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-16]
##[group]Clock drift check
  local time: Mon Jan  1 02:45:06 UTC 2024
  network time: Mon, 01 Jan 2024 02:45:06 GMT
  network time: Mon, 01 Jan 2024 02:45:06 GMT
##[endgroup]
sccache: Starting the server...
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-16', '--enable-llvm-link-shared', '--set', 'rust.thin-lto-import-instr-limit=10', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--enable-new-symbol-mangling']
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-16/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.thin-lto-import-instr-limit := 10
configure: rust.codegen-units-std := 1
---

error: compilation failed!
status: exit status: 1
Build completed unsuccessfully in 0:13:26
command: RUSTC_ICE="0" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/mir-opt/reference_prop.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" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "--target=x86_64-unknown-linux-gnu" "-O" "-Copt-level=1" "-Zdump-mir=ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation | ReferencePropagation" "-Zvalidate-mir" "-Zlint-mir" "-Zdump-mir-exclude-pass-number" "-Zmir-opt-level=0" "-Zmir-enable-passes=+ReferencePropagation" "-Zdump-mir-dir=/checkout/obj/build/x86_64-unknown-linux-gnu/test/mir-opt/reference_prop" "--emit" "mir" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/mir-opt/reference_prop" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/mir-opt/reference_prop/auxiliary"
--- stderr -------------------------------
warning: unused variable: `c`
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:22:13
   |
   |
22 |         let c = *b; // This should be optimized.
   |             ^ help: if this is intentional, prefix it with an underscore: `_c`
   = note: `#[warn(unused_variables)]` on by default

warning: value assigned to `b` is never read
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:38:17
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:38:17
   |
38 |         let mut b = &a;
   |                 ^
   |
   = help: maybe it is overwritten before being read?

warning: unused variable: `c`
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:41:13
   |
   |
41 |         let c = *b;
   |             ^ help: if this is intentional, prefix it with an underscore: `_c`

warning: unused variable: `c`
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:56:13
   |
56 |         let c = *b; // `b` is immutably borrowed, we know its value, but do not propagate it
   |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:71:13
   |
   |
71 |         let c = *b; // `b` is mutably borrowed, we cannot know its value.
   |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]  --> /checkout/tests/mir-opt/reference_prop.rs:84:13
   |
84 |         let c = *b;
---

warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:116:13
    |
116 |         let b = *a; // This should be optimized as `*single`.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`

warning: value assigned to `multiple` is never read
    |
    |
129 |         multiple = &*single;
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:130:13
    |
    |
130 |         let b = *a; // This should not be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:145:13
    |
    |
145 |         let d = &b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:146:13
    |
    |
146 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:161:13
    |
    |
161 |         let d = &mut b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:162:13
    |
    |
162 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:179:13
    |
    |
179 |         let c = *b; // This should be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: value assigned to `b` is never read
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:195:17
    |
195 |         let mut b = &mut a;
195 |         let mut b = &mut a;
    |                 ^
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:198:13
    |
198 |         let c = *b;
198 |         let c = *b;
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`

warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:213:13
    |
213 |         let c = *b; // `b` is immutably borrowed, we know its value, but cannot be removed.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:228:13
    |
    |
228 |         let c = *b; // `b` is mutably borrowed, we cannot know its value.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:241:13
    |
241 |         let c = *b;
---

warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:273:13
    |
273 |         let b = *a; // This should be optimized as `*single`.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`

warning: value assigned to `multiple` is never read
    |
    |
286 |         multiple = &mut *single;
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:287:13
    |
    |
287 |         let b = *a; // This should not be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:302:13
    |
    |
302 |         let d = &b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:303:13
    |
    |
303 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:318:13
    |
    |
318 |         let d = &mut b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:319:13
    |
    |
319 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:336:13
    |
    |
336 |         let c = *b; // This should be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: value assigned to `b` is never read
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:352:17
    |
    |
352 |         let mut b = &raw const a;
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:355:13
    |
355 |         let c = *b;
355 |         let c = *b;
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`

warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:370:13
    |
370 |         let c = *b; // `b` is immutably borrowed, we know its value, but cannot be removed.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:385:13
    |
    |
385 |         let c = *b; // `b` is mutably borrowed, we cannot know its value.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:398:13
    |
398 |         let c = *b;
---

warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:430:13
    |
430 |         let b = *a; // This should be optimized as `*single`.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`

warning: value assigned to `multiple` is never read
    |
    |
443 |         multiple = &raw const *single;
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:444:13
    |
    |
444 |         let b = *a; // This should not be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
warning: unused variable: `e`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:459:13
    |
459 |         let e = *c;
459 |         let e = *c;
    |             ^ help: if this is intentional, prefix it with an underscore: `_e`

warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:474:13
    |
474 |         let d = &b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:475:13
    |
    |
475 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:490:13
    |
    |
490 |         let d = &mut b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:491:13
    |
    |
491 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:508:13
    |
    |
508 |         let c = *b; // This should be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: value assigned to `b` is never read
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:524:17
    |
    |
524 |         let mut b = &raw mut a;
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:527:13
    |
527 |         let c = *b;
527 |         let c = *b;
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`

warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:542:13
    |
542 |         let c = *b; // `b` is immutably borrowed, we know its value, but cannot be removed.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:557:13
    |
    |
557 |         let c = *b; // `b` is mutably borrowed, we cannot know its value.
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:570:13
    |
570 |         let c = *b;
---

warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:602:13
    |
602 |         let b = *a; // This should be optimized as `*single`.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`

warning: value assigned to `multiple` is never read
    |
    |
615 |         multiple = &raw mut *single;
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `b`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:616:13
    |
    |
616 |         let b = *a; // This should not be optimized.
    |             ^ help: if this is intentional, prefix it with an underscore: `_b`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:631:13
    |
    |
631 |         let d = &b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:632:13
    |
    |
632 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:647:13
    |
    |
647 |         let d = &mut b; // first round promotes debuginfo for `d`
    |             ^ help: if this is intentional, prefix it with an underscore: `_d`
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:648:13
    |
    |
648 |         let c = *b; // second round propagates this dereference
    |             ^ help: if this is intentional, prefix it with an underscore: `_c`
warning: value assigned to `RET` is never read
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:674:13
    |
674 |             RET = *p1;
674 |             RET = *p1;
    |             ^^^
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `c`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:718:13
    |
718 |         let c: i32;
718 |         let c: i32;
    |             ^
    |
help: `c` is captured in macro and introduced a unused variable
    |
715 | /     mir!(
716 | |         let x: i32;
716 | |         let x: i32;
717 | |         let r: &i32;
718 | |         let c: i32;
735 | |         }
736 | |     )
    | |_____^
    = note: this warning originates in the macro `mir` (in Nightly builds, run with -Z macro-backtrace for more info)
    = note: this warning originates in the macro `mir` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused variable: `d`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:719:13
    |
719 |         let d: bool;
    |             ^
    |
help: `d` is captured in macro and introduced a unused variable
    |
715 | /     mir!(
716 | |         let x: i32;
716 | |         let x: i32;
717 | |         let r: &i32;
718 | |         let c: i32;
735 | |         }
736 | |     )
    | |_____^
    = note: this warning originates in the macro `mir` (in Nightly builds, run with -Z macro-backtrace for more info)
    = note: this warning originates in the macro `mir` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: value assigned to `RET` is never read
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:765:18
    |
765 |             Call(RET = opaque(u), bb2, UnwindContinue())
    |
    |
    = help: maybe it is overwritten before being read?
warning: value assigned to `RET` is never read
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:770:18
    |
    |
770 |             Call(RET = opaque(z), bb3, UnwindContinue())
    |
    |
    = help: maybe it is overwritten before being read?
warning: unused variable: `field`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:837:9
    |
    |
837 |     let field = &T(0).0;
    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_field`
warning: unused variable: `reborrow`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:840:9
    |
    |
840 |     let reborrow = &*ref_mut_u8;
    |         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_reborrow`
warning: unused variable: `variant_field`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:844:18
    |
844 |         Some(ref variant_field) => {}
844 |         Some(ref variant_field) => {}
    |                  ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_variant_field`

warning: unused variable: `constant_index`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:849:20
    |
849 |     if let [_, ref constant_index, subslice @ .., ref constant_index_from_end] = &[6; 10][..] {
    |                    ^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_constant_index`
warning: unused variable: `subslice`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:849:36
    |
    |
849 |     if let [_, ref constant_index, subslice @ .., ref constant_index_from_end] = &[6; 10][..] {
    |                                    ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_subslice`
warning: unused variable: `constant_index_from_end`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:849:55
    |
    |
849 |     if let [_, ref constant_index, subslice @ .., ref constant_index_from_end] = &[6; 10][..] {
    |                                                       ^^^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_constant_index_from_end`

warning: unused variable: `multiple_borrow`
    |
    |
852 |     let multiple_borrow = &&&mut T(6).0;
    |         ^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_multiple_borrow`
warning: unused variable: `many_borrow`
##[warning]   --> /checkout/tests/mir-opt/reference_prop.rs:863:9
    |
863 |     let many_borrow =
863 |     let many_borrow =
    |         ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_many_borrow`

error: broken MIR in Item(DefId(0:16 ~ reference_prop[3863]::multiple_storage)) (after pass RemoveUnneededDrops) at bb1[0]:
       local _1 still has storage when returning from function
    |
703 |             Return()
    |             ^^^^^^^^
    |
    |
    = note: `#[deny(rustc::broken_mir)]` on by default

error: broken MIR in Item(DefId(0:16 ~ reference_prop[3863]::multiple_storage)) (after pass ReferencePropagation) at bb1[0]:
       local _1 still has storage when returning from function
    |
703 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:16 ~ reference_prop[3863]::multiple_storage)) (after pass AddCallGuards) at bb1[0]:
       local _1 still has storage when returning from function
    |
703 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:16 ~ reference_prop[3863]::multiple_storage)) (after pass PreCodegen) at bb1[0]:
       local _1 still has storage when returning from function
    |
703 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:16 ~ reference_prop[3863]::multiple_storage)) (after phase change to runtime-optimized) at bb1[0]:
       local _1 still has storage when returning from function
    |
703 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass RemoveUnneededDrops) at bb1[0]:
       use of local _1, which has no storage here
    |
722 |             x = 5;
    |             ^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass RemoveUnneededDrops) at bb1[1]:
       use of local _1, which has no storage here
    |
723 |             r = &x;
    |             ^^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass ReferencePropagation) at bb1[0]:
       use of local _1, which has no storage here
    |
722 |             x = 5;
    |             ^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass ReferencePropagation) at bb1[1]:
       use of local _1, which has no storage here
    |
723 |             r = &x;
    |             ^^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass AddCallGuards) at bb1[0]:
       use of local _1, which has no storage here
    |
722 |             x = 5;
    |             ^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass AddCallGuards) at bb1[1]:
       use of local _1, which has no storage here
    |
723 |             r = &x;
    |             ^^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass PreCodegen) at bb1[0]:
       use of local _1, which has no storage here
    |
722 |             x = 5;
    |             ^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after pass PreCodegen) at bb1[1]:
       use of local _1, which has no storage here
    |
723 |             r = &x;
    |             ^^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after phase change to runtime-optimized) at bb1[0]:
       use of local _1, which has no storage here
    |
722 |             x = 5;
    |             ^^^^^


error: broken MIR in Item(DefId(0:18 ~ reference_prop[3863]::dominate_storage)) (after phase change to runtime-optimized) at bb1[1]:
       use of local _1, which has no storage here
    |
723 |             r = &x;
    |             ^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass RemoveUnneededDrops) at bb4[0]:
       local _2 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass RemoveUnneededDrops) at bb4[0]:
       local _3 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass ReferencePropagation) at bb4[0]:
       local _2 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass ReferencePropagation) at bb4[0]:
       local _3 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass AddCallGuards) at bb4[0]:
       local _2 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass AddCallGuards) at bb4[0]:
       local _3 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass PreCodegen) at bb4[0]:
       local _2 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after pass PreCodegen) at bb4[0]:
       local _3 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after phase change to runtime-optimized) at bb4[0]:
       local _2 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^


error: broken MIR in Item(DefId(0:20 ~ reference_prop[3863]::maybe_dead)) (after phase change to runtime-optimized) at bb4[0]:
       local _3 still has storage when returning from function
    |
779 |             Return()
    |             ^^^^^^^^

[bors]

☔ The latest upstream changes (presumably #119621) made this pull request unmergeable. Please resolve the merge conflicts.

[compiler-errors]

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