Comments (5)
miette does have backtrace printing/hook capabilities for panics. What I'm looking for is support for printing backtraces from backtrace fields in errors. From thiserror
docs:
anyhow
then looks for these provided backtraces and prints them. From the anyhow
docs:
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@zkat I've been working on some basic backtrace stuff with miette as a library user, but I could try to adapt it into a proper feature at some point.
backtrace code I pulled directly from human-panic, which is also what eyre uses last I checked: https://github.com/cloudtruth/cloudtruth-cli/blob/8ba6b5a4bfde7684cbeac128f68fa4f4f4366408/crates/integration-test-harness/src/backtrace.rs#L13
And then I created a very basic Diagnostic for panic messages with an optional backtrace: https://github.com/cloudtruth/cloudtruth-cli/blob/8ba6b5a4bfde7684cbeac128f68fa4f4f4366408/crates/integration-test-harness/src/panic.rs#L55
What do you think the best approach is for adding something like this to the library? Something similar to eyre does it where it just checks for RUST_BACKTRACE and RUST_SPANTRACE? Also a fancier backtrace renderer is probably in order.
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The use case with backtraces that I built on top of miette is to actually show source code from failing unit tests. To do this I use track_caller
to find the source file of the code that installed the panic handler, and then search the backtrace for the first frame matching that directory path. See https://github.com/cloudtruth/cloudtruth-cli/blob/8ba6b5a4bfde7684cbeac128f68fa4f4f4366408/crates/integration-test-harness/src/source_span.rs#L75
The install function is called on each test from a #[use_test_harness]
attribute that I wrote.
Maybe this could be a second crate that someone could choose to pull in if they're specifically wanting better cargo test reports?
from miette.
Made some improvements on my previous version of panic reporting by using actual Diagnostics sources instead of ad-hoc cause chains. So now there's a root Panic
report and then a PanicLocation
report on top of it if the panic location is available. See code here
Output example with backtrace:
without backtrace:
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here's miette's panic hook stuff: https://github.com/zkat/miette/blob/main/src/panic.rs
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Related Issues (20)
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