Change:
trait Trait<const N: Trait = bar> { <del> //~^ ERROR cannot find value `bar` in this scope //~| ERROR cycle detected when computing type of `Trait::N` //~| ERROR cycle detected when computing type of `Trait::N` //~| ERROR `(dyn Trait<{const error}> + 'static)` is forbidden as the type of a const generic parameter //~| WARN trait objects without an explicit `dyn` are deprecated //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! fn fnc(&self) { </del> <ins> //~^ ERROR cannot find value `bar` in this scope //~| ERROR cycle detected when computing type of `Trait::N` //~| ERROR cycle detected when computing type of `Trait::N` //~| ERROR the trait `Trait` cannot be made into an object //~| ERROR the trait `Trait` cannot be made into an object //~| ERROR the trait `Trait` cannot be made into an object //~| ERROR `(dyn Trait<{const error}> + 'static)` is forbidden as the type of a const generic parameter //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! fn fnc<const N: Trait = u32>(&self) -> Trait { //~^ ERROR the name `N` is already used for a generic parameter in this item's generic parameters //~| ERROR expected value, found builtin type `u32` //~| ERROR defaults for const parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions //~| ERROR associated item referring to unboxed trait object for its own trait //~| ERROR the trait `Trait` cannot be made into an object //~| ERROR `(dyn Trait<{const error}> + 'static)` is forbidden as the type of a const generic parameter //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! //~| WARN trait objects without an explicit `dyn` are deprecated [bare_trait_objects] //~| WARN this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021! bar //~^ ERROR cannot find value `bar` in this scope </ins> } }

Discussion:
<!-- [31mICE[0m: Rustc '-Zincremental-verify-ich=yes -Cincremental=<dir-Cdebuginfo=2' 'error: internal compiler error: Unexpected node AnonConst(AnonConst { hirid: HirId(DefId(0:3 ~ [9608]::Trait).5), defid: DefId(0:5 ~ [9608]::Trait::{constant}), body: BodyId { hirid: HirId(DefId(0:3 ~ [9608]::Trait).6) } })', 'error: internal compiler error: Unexpected node AnonConst(AnonConst { hirid: HirId(DefId(0:3 ~ [9608]::Trait).5), defid: DefId(0:5 ~ [9608]::Trait::{constant}), body: BodyId { hirid: HirId(DefId(0:3 ~ [9608]::Trait).6) } })' File: --auto-reduced (treereduce-rust): original: Version information ` Command: <!-- Include a backtrace in the code block by setting in your environment. E.g. .

--<details<summary<strongProgram output</strong</summary<p</p</details<!-- query stack: note: compiler flags: -Z incremental-verify-ich=yes -C incremental=[REDACTED] -C debuginfo=2 [diagnostichirwfcheck] performing HIR wf-checking for predicate at item [typeck] type-checking [checkmatch] match-checking [mirbuilt] building MIR for [mirconst] preparing for borrow checking [mirconstqualif] const checking [mirpromoted] promoting constants in MIR for [mirborrowck] borrow-checking [mirdropselaboratedandconstchecked] elaborating drops for [mirforctfe] caching mir of for CTFE [evaltoallocationraw] const-evaluating + checking [evaltovaltree] evaluating type-level constant [checkwellformed] checking that is well-formed [checkmodtypewf] checking that types are well-formed in top-level module [analysis] running analysis passes on this crate --<!-- TRIAGEBOTSTART --<!-- TRIAGEBOTASSIGNSTART --<!-- TRIAGEBOTASSIGNDATASTARTTRIAGEBOTASSIGNDATAEND --<!-- TRIAGEBOTASSIGNEND --<!-- TRIAGEBOTEND --
This seeeems to bisect to :thinking: cc
Thanks Will take a look. claim
Reduced further:
the original (none reduced) one still ices :sweat_smile:
From what I can tell, it seems to have been fixed : Looks like I'm missing something
I have now opened PR to test the below original reproducer:
Sorry for causing the issue to be closed via the PR merge without asking you first. If you still believe the ICE is not fixed please reopen it.