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core: format error backtraces with display #3935

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Merged
domenukk merged 1 commit into from
Oct 26, 2026
Merged

core: format error backtraces with display #3935

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11 changes: 10 additions & 1 deletion crates/libafl_core/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -125,7 +125,7 @@ impl ErrorBacktrace {

#[cfg(feature = "errors_backtrace")]
fn display_error_backtrace(f: &mut fmt::Formatter, err: &ErrorBacktrace) -> fmt::Result {
write!(f, "\nBacktrace: {err:?}")
write!(f, "\nBacktrace: {err}")
}
#[cfg(not(feature = "errors_backtrace"))]
#[expect(clippy::unnecessary_wraps)]
Expand Down Expand Up @@ -940,6 +940,15 @@ mod tests {
assert!(err.to_string().starts_with("Illegal argument: bad_arg"));
}

#[test]
#[cfg(feature = "errors_backtrace")]
fn test_error_backtrace_display() {
let backtrace = ErrorBacktrace::force_capture();
let expected = alloc::format!("Runtime error: test\nBacktrace: {backtrace}");
let err = Error::Runtime("test".into(), backtrace);
assert_eq!(err.to_string(), expected);
}

#[test]
#[allow(deprecated)]
fn test_deprecated_as_slice_fallbacks() {
Expand Down
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