Some compile errors within const block of associated constants are not evaluated

[DoumanAsh]

Basically, if you put potential error into const block of associated constant, it doesn't gets evaluated.
Good example is arithmetic_overflow.
By default it triggers compilation error, but not when it is within const block of associated constant

Rust playgound sample:
https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=6ae8ce6871821d8fce58cc05dbdd5984

Doubt it is expected behavior?

Instead, this happened: explanation

Happens in both latest stable and nightly

[jonas-schievink]

Duplicate of #71282