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Rollup merge of #68899 - kinseytamsin:lexerror-error-impl, r=Centril

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Add Display and Error impls for proc_macro::LexError

This should allow LexError to play much nicer with the `?` operator.

Fixes #68896.

(I'm not sure if I did the stability attributes right, so if I need to change them, please let me know!)
This commit is contained in:
Mazdak Farrokhzad 2020-03-12 16:32:07 +01:00 committed by GitHub
commit 703dcff081
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1 changed files with 11 additions and 1 deletions
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12
src/libproc_macro/lib.rs
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@ -41,7 +41,7 @@ pub use diagnostic::{Diagnostic, Level, MultiSpan};
use std::ops::{Bound, RangeBounds};
use std::path::PathBuf;
use std::str::FromStr;
use std::{fmt, iter, mem};
use std::{error, fmt, iter, mem};
/// The main type provided by this crate, representing an abstract stream of
/// tokens, or, more specifically, a sequence of token trees.
@ -66,6 +66,16 @@ pub struct LexError {
_inner: (),
}
#[stable(feature = "proc_macro_lexerror_impls", since = "1.44.0")]
impl fmt::Display for LexError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("cannot parse string into token stream")
}
}
#[stable(feature = "proc_macro_lexerror_impls", since = "1.44.0")]
impl error::Error for LexError {}
#[stable(feature = "proc_macro_lib", since = "1.15.0")]
impl !Send for LexError {}
#[stable(feature = "proc_macro_lib", since = "1.15.0")]