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Merge pull request #3 from dtolnay/literal

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Accept string literal in bail macro
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David Tolnay 2019-10-07 13:21:37 -07:00 committed by GitHub
commit dcb6b794cc
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2 changed files with 31 additions and 0 deletions
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3
src/lib.rs
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@ -283,6 +283,9 @@ pub type Result<T> = std::result::Result<T, Error>;
/// ```
#[macro_export]
macro_rules! bail {
($msg:literal $(,)?) => {
return std::result::Result::Err($crate::anyhow!($msg));
};
($err:expr $(,)?) => {
return std::result::Result::Err(std::convert::From::from($err));
};

28
tests/macros.rs Normal file
View File

@ -0,0 +1,28 @@
use anyhow::{bail, Result};
use std::io;
fn bail_literal() -> Result<()> {
bail!("oh no!");
}
fn bail_fmt() -> Result<()> {
bail!("{} {}!", "oh", "no");
}
fn bail_error() -> Result<()> {
bail!(io::Error::new(io::ErrorKind::Other, "oh no!"));
}
#[test]
fn test_messages() {
assert_eq!("oh no!", bail_literal().unwrap_err().to_string());
assert_eq!("oh no!", bail_fmt().unwrap_err().to_string());
assert_eq!("oh no!", bail_error().unwrap_err().to_string());
}
#[test]
fn test_downcast() {
assert_eq!("oh no!", bail_literal().unwrap_err().downcast::<&str>().unwrap());
assert_eq!("oh no!", bail_fmt().unwrap_err().downcast::<String>().unwrap());
assert_eq!("oh no!", bail_error().unwrap_err().downcast::<io::Error>().unwrap().to_string());
}