Normalize test output more thoroughly
This prevents differences in local environments, which may (for example) end up with a longer backtrace with more digits in the backtrace prefix, as happened to me. While we're at it, clean more of the output up, including the exact location of the error in the compiler.
cc https://github.com/rust-lang/rust/pull/106521 which introduced this test
This prevents differences in local environments, which may (for example)
end up with a longer backtrace with more digits in the backtrace prefix,
as happened to me. While we're at it, clean more of the output up,
including the exact location of the error in the compiler.
