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### What it does
Checks for use of `crate` as opposed to `$crate` in a macro definition.
### Why is this bad?
`crate` refers to the macro call's crate, whereas `$crate` refers to the macro definition's
crate. Rarely is the former intended. See:
https://doc.rust-lang.org/reference/macros-by-example.html#hygiene
### Example
```
#[macro_export]
macro_rules! print_message {
() => {
println!("{}", crate::MESSAGE);
};
}
pub const MESSAGE: &str = "Hello!";
```
Use instead:
```
#[macro_export]
macro_rules! print_message {
() => {
println!("{}", $crate::MESSAGE);
};
}
pub const MESSAGE: &str = "Hello!";
```
Note that if the use of `crate` is intentional, an `allow` attribute can be applied to the
macro definition, e.g.:
```
#[allow(clippy::crate_in_macro_def)]
macro_rules! ok { ... crate::foo ... }
```
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