Generic unit variants are handled incorrectly inside format args #332
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Description
The following is a valid format expression, but thiserror fails to compile it.
use thiserror::Error;
#[derive(Debug, Error)]
#[error("{}", None::<i32>.is_some())]
pub struct Error;
fn main() {
println!("{}", None::<i32>.is_some());
}error: expected one of `!`, `,`, `.`, `::`, `?`, `{`, or an operator, found `is_some`
--> src/main.rs:4:27
|
4 | #[error("{}", None::<i32>.is_some())]
| ^^^^^^^ expected one of 7 possible tokensMetadata
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