Do something better when there's a mismatch between identical-looking regions

[brson]

It's a very common experience for rustc to tell you it couldn't unify two regions, then print out the span of those regions, only to have them look identical. Seeing enough of these can be rage-inducing.

I don't have a great concrete suggestion, but even just printing a single region and saying something like 'yeah, I know these regions look the same. sorry', might ease the pain a bit.

[pnkfelix]

cc me

[steveklabnik]

Triage: unsure if this is still a problem, exactly. @brson how do you feel about this now?

[pnkfelix]

I think we still encounter this (though maybe the finer grain scopes added due to dropck have made slightly different scopes, and thus shifted the rage slightly).

@brson's suggestion of at least acknowledging when the spans are identical might still be a good idea for the short term.

[brson]

I haven't seen this recently, but I haven't written a lot of Rust recently.

[steveklabnik]

I'm going to close this issue for being a bit too vague. If you see something like it with some concrete code, please open a new issue so we can tackle those specific issues.