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Recognize literal anyhow as a special case

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David Tolnay 2019-10-08 17:23:14 -07:00
parent 443cc8dedb
commit 38c8d78f09
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 15 additions and 2 deletions
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17
src/lib.rs
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@ -285,6 +285,9 @@ pub type Result<T, E = Error> = std::result::Result<T, E>;
/// ```
#[macro_export]
macro_rules! bail {
($msg:literal $(,)?) => {
return std::result::Result::Err($crate::anyhow!($msg));
};
($err:expr $(,)?) => {
return std::result::Result::Err($crate::anyhow!($err));
};
@ -351,6 +354,11 @@ macro_rules! bail {
/// ```
#[macro_export]
macro_rules! ensure {
($cond:expr, $msg:literal $(,)?) => {
if !$cond {
return std::result::Result::Err($crate::anyhow!($msg));
}
};
($cond:expr, $err:expr $(,)?) => {
if !$cond {
return std::result::Result::Err($crate::anyhow!($err));
@ -387,10 +395,15 @@ macro_rules! ensure {
/// ```
#[macro_export]
macro_rules! anyhow {
($msg:expr $(,)?) => ({
($msg:literal $(,)?) => {
// Handle $:literal as a special case to make cargo-expanded code more
// concise in the common case.
$crate::private::new_adhoc($msg)
};
($err:expr $(,)?) => ({
#[allow(unused_imports)]
use $crate::private::{AdhocKind, TraitKind};
let error = $msg;
let error = $err;
error.anyhow_kind().new(error)
});
($fmt:expr, $($arg:tt)*) => {