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Provide suggestion for anyone grepping for concat

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David Tolnay 2020-10-17 11:00:59 -07:00
parent 04d2e6c998
commit fbe9804476
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2 changed files with 5 additions and 3 deletions
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2
tests/ui/concat-display.rs
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@ -2,6 +2,8 @@ use thiserror::Error;
macro_rules! error_type {
($name:ident, $what:expr) => {
// Use #[error("invalid {}", $what)] instead.
#[derive(Error, Debug)]
#[error(concat!("invalid ", $what))]
pub struct $name;

6
tests/ui/concat-display.stderr
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@ -1,10 +1,10 @@
error: expected string literal
--> $DIR/concat-display.rs:6:17
--> $DIR/concat-display.rs:8:17
|
6 | #[error(concat!("invalid ", $what))]
8 | #[error(concat!("invalid ", $what))]
| ^^^^^^
...
11 | error_type!(Error, "foo");
13 | error_type!(Error, "foo");
| -------------------------- in this macro invocation
|
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)