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pub(crate) trait SpanError {
#[allow(non_snake_case)]
fn EXPECTED_Span_OR_ToTokens<D: std::fmt::Display>(&self, msg: D) -> syn::Error;
}
pub(crate) trait ToTokensError {
#[allow(non_snake_case)]
fn EXPECTED_Span_OR_ToTokens<D: std::fmt::Display>(&self, msg: D) -> syn::Error;
}
impl<T: quote::ToTokens> ToTokensError for T {
fn EXPECTED_Span_OR_ToTokens<D: std::fmt::Display>(&self, msg: D) -> syn::Error {
// Curb monomorphization from generating too many identical `new_spanned`.
syn::Error::new_spanned(self.to_token_stream(), msg)
}
}
impl SpanError for proc_macro2::Span {
fn EXPECTED_Span_OR_ToTokens<D: std::fmt::Display>(&self, msg: D) -> syn::Error {
syn::Error::new(*self, msg)
}
}