Internal Compiler Error: Switch on discriminant of non-ADT

[lawliet89]

I was running Clippy on code in this specific commit and I ran into the compiler error below:

    Checking vault-k8s-helper v0.3.0 (/home/yongwen/work/open/vault-gke-helper)
error: internal compiler error: src/librustc_mir/dataflow/generic/engine.rs:315: Switch on discriminant of non-ADT

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:881:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust-clippy/issues/new

note: Clippy version: clippy 0.0.212 (fc5d0cc 2020-02-24)

error: aborting due to previous error

error: could not compile `vault-k8s-helper`.

To learn more, run the command again with --verbose.

clippy 0.0.212 (fc5d0cc 2020-02-24)

[JohnTitor]

Duplicate of #5238 and it's already fixed in latest nightly rustc, closing.