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Harald Hoyer 2018-12-20 15:14:21 +01:00
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booksrc/tutorial4.md
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## Saving coding chars
Because decorating an error with more information should not
let you jump through hoops, `chainerror` has a quick macro for that.
`mstrerror!()` fits right into `.map_err()` letting you quickly add
more debug strings.
`mstrerror!()` even understands `format!()` syntax like `println!()`.
~~~rust
use crate::chainerror::*;
{{#include ../examples/tutorial4.rs:2:}}