Testsuite compile-fail error checking requires you to be very explicit

[mdinger]

#19870 (comment) multi-line errors are being implemented and once enabled, a compile fail mismatched types error, for example, requires all 5 lines of errors to be matched.

It would be nice if you could opt out of this partially at least so you only need to match one error. It may be particularly confusing in places like this (also below) which gives 2 errors on one line. This runs together to 10 lines of errors which must be annotated.

fn main() { let a: bool = 1is; let b: isize = true; }
//~^ ERROR mismatched types
//~| expected `bool`
//~| found `isize`
//~| expected bool
//~| found isize
//~| ERROR mismatched types
//~| expected `isize`
//~| found `bool`
//~| expected isize
//~| found bool

cc @nick29581

[steveklabnik]

Triage: no changes here that I'm aware of.

[Mark-Simulacrum]

Still no changes I'm aware of, though UI tests in some cases are better for this. There has been some discussion about unifying compiler error testing, though I don't have a link. I'm not sure there's really a fix for this issue though, since checking all lines of the error is still necessary to make sure the error didn't change.

[steveklabnik]

I'm not sure there's really a fix for this issue though,

Given there's been two years without comment, I'm guessing that this is good enough. Closing.