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Detect duplicate attributes on the same syntax tree node

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David Tolnay 2019-10-12 09:49:36 -07:00
parent 3d43d39ed1
commit b78fe1891b
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1 changed files with 11 additions and 1 deletions
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12
impl/src/attr.rs
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@ -3,7 +3,8 @@ use quote::{format_ident, quote, ToTokens};
use std::iter::once;
use syn::parse::{Nothing, ParseStream};
use syn::{
braced, bracketed, parenthesized, token, Attribute, Ident, Index, LitInt, LitStr, Result, Token,
braced, bracketed, parenthesized, token, Attribute, Error, Ident, Index, LitInt, LitStr,
Result, Token,
};
pub struct Attrs {
@ -26,9 +27,18 @@ pub fn get(input: &[Attribute]) -> Result<Attrs> {
for attr in input {
if attr.path.is_ident("error") {
let display = parse_display(attr)?;
if attrs.display.is_some() {
return Err(Error::new_spanned(
attr,
"only one #[error(...)] attribute is allowed",
));
}
attrs.display = Some(display);
} else if attr.path.is_ident("source") {
parse_source(attr)?;
if attrs.source {
return Err(Error::new_spanned(attr, "duplicate #[source] attribute"));
}
attrs.source = true;
}
}