ICE while switching a type definition between enum and trait

[topecongiro]

I have observed an ICE when I run cargo check. At that time I was switching a type definition between enum and trait on my own type.

At first I was using a trait:

trait Block {
 // ...
}

on implementing it further I realized that I needed to use GAT, so I switched to using an enum:

enum Block {
  // ...
}

and then I encountered the ICE.

The error message is as follows:

error: internal compiler error: src/librustc/dep_graph/graph.rs:688: DepNode Hir(rustfmt_nightly[590c]::visitable[0]::Block[0]::items[0]) should have been pre-allocated but wasn't.

The ICE disappeared after I run cargo clean. I have not yet able to reproduce it. I will update this issue once I come up with a minimal working example.

rustc version

rustc 1.38.0-nightly (07e0c3651 2019-07-16)

[hellow554]

Maybe related to #62649 ?

[jonas-schievink]

Yeah, looks like a pretty clear duplicate. Closing.