regression: ICE adjusting Expr can't compose Pointer(Unsize)

[Mark-Simulacrum]

Crater picked up this issue:

• https://crater-reports.s3.amazonaws.com/beta-1.60-1/beta-2022-02-22/gh/cpg1111.conspect/log.txt

stack backtrace:
[INFO] [stdout] error: internal compiler error: compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs:318:26: while adjusting Expr { hir_id: HirId { owner: DefId(0:181 ~ conspect[9ddb]::manager::{impl#0}::match_ns), local_id: 68 }, kind: Box(Expr { hir_id: HirId { owner: DefId(0:181 ~ conspect[9ddb]::manager::{impl#0}::match_ns), local_id: 67 }, kind: Array([Expr { hir_id: HirId { owner: DefId(0:181 ~ conspect[9ddb]::manager::{impl#0}::match_ns), local_id: 66 }, kind: Path(Resolved(None, Path { span: src/manager/mod.rs:40:41: 40:48 (#0), res: Local(HirId { owner: DefId(0:181 ~ conspect[9ddb]::manager::{impl#0}::match_ns), local_id: 4 }), segments: [PathSegment { ident: process#0, hir_id: Some(HirId { owner: DefId(0:181 ~ conspect[9ddb]::manager::{impl#0}::match_ns), local_id: 65 }), res: Some(Local(HirId { owner: DefId(0:181 ~ conspect[9ddb]::manager::{impl#0}::match_ns), local_id: 4 })), args: None, infer_args: true }] })), span: src/manager/mod.rs:40:41: 40:48 (#0) }]), span: /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/alloc/src/macros.rs:50:56: 50:65 (#32) }), span: /rustc/0a4f984a87c7ba6c74ec3e78442fec955a419e32/library/alloc/src/macros.rs:50:52: 50:65 (#32) }, can't compose [Pointer(Unsize) -> _] and [Pointer(Unsize) -> _]

[oli-obk]

Should probably become a delay span bug, I don't see this happening unless there are other errors involved

[compiler-errors]

This is (probably) fixed in #94438. As soon as I fix #94516, we should probably backport both of those together, because there is a potential for more ICEs like this. I can look into making this an MVCE.

[compiler-errors]

Minimization is included as test in #94596

[compiler-errors]

@rustbot claim

[compiler-errors]

The fixes for this were beta-backpoorted in #94933, should we close this @Mark-Simulacrum?