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treat-err-as-bug=n means panic on nth error

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Santiago Pastorino 2020-04-24 01:08:58 -03:00 committed by Who? Me?!
parent 07c46e7dcf
commit 1b0f87c8dc
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10
src/compiler-debugging.md
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@ -69,11 +69,11 @@ stack backtrace:
## Getting a backtrace for errors
[getting-a-backtrace-for-errors]: #getting-a-backtrace-for-errors
If you want to get a backtrace to the point where the compiler emits
an error message, you can pass the `-Z treat-err-as-bug=n`, which
will make the compiler skip `n` errors or `delay_span_bug` calls and then
panic on the next one. If you leave off `=n`, the compiler will assume `0` for
`n` and thus panic on the first error it encounters.
If you want to get a backtrace to the point where the compiler emits an
error message, you can pass the `-Z treat-err-as-bug=n`, which will make
the compiler panic on the `nth` error on `delay_span_bug.` If you leave
off `=n`, the compiler will assume `1` for `n` and thus panic on the
first error it encounters.
This can also help when debugging `delay_span_bug` calls - it will make
the first `delay_span_bug` call panic, which will give you a useful backtrace.