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failure with non-UTF8 formatting leads to hard-to-debug error #16877

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huonw opened this Issue Aug 30, 2014 · 0 comments

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huonw commented Aug 30, 2014

struct Foo;
impl std::fmt::Show for Foo {
    fn fmt(&self, fmtr:&mut std::fmt::Formatter) -> std::fmt::Result { 
        fmtr.write(&[0xFF])
    }
}
fn main() {
    fail!("{}", Foo)
}
task '<main>' failed at 'called `Result::unwrap()` on an `Err` value: [255]', /build/rust-git/src/rust/src/libcore/result.rs:548
playpen: application terminated with error code 101

At the very least it could mention the failure was caused by bad formatting while trying to unwind, or could use from_utf8_lossy.

bors added a commit that referenced this issue Sep 3, 2014

@bors bors closed this in #16940 Sep 3, 2014

nrc added a commit to nrc/rust that referenced this issue Sep 5, 2014

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