Add example for expressions in error
attribute
#175
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Hi @dtolnay, that you so much for this awesome crate. I use it everywhere all the time (together with
anyhow
).Was trying to figure out how to nicely display an
Option<T>
value in the error message, instead of just using{0:?}
and havingSome("...")/None
in the displayed message.So I found a nice test case in
tests/test_display.rs
, and thought it might be nice to add a tinyexample to the README.md and crate docs, to showcase that expressions are possible in the
#[error("...")]
attribute as well.Wording of the example could maybe be a bit improved, I'm not as good of a writer as you 🙇♂️.