thiserror_impl/
fallback.rs1use crate::expand::call_site_ident;
2use crate::private;
3use proc_macro2::TokenStream;
4use quote::quote;
5use syn::DeriveInput;
6
7pub(crate) fn expand(input: &DeriveInput, error: syn::Error) -> TokenStream {
8 let ty = call_site_ident(&input.ident);
9 let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
10
11 let error = error.to_compile_error();
12
13 {
let mut _s = ::quote::__private::TokenStream::new();
::quote::ToTokens::to_tokens(&error, &mut _s);
::quote::__private::push_pound(&mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Bracket,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s, "allow");
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Parenthesis,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s,
"unused_qualifications");
_s
});
_s
});
::quote::__private::push_pound(&mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Bracket,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s, "automatically_derived");
_s
});
::quote::__private::push_ident(&mut _s, "impl");
::quote::ToTokens::to_tokens(&impl_generics, &mut _s);
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "thiserror");
::quote::__private::push_colon2(&mut _s);
::quote::ToTokens::to_tokens(&private, &mut _s);
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "Error");
::quote::__private::push_ident(&mut _s, "for");
::quote::ToTokens::to_tokens(&ty, &mut _s);
::quote::ToTokens::to_tokens(&ty_generics, &mut _s);
::quote::ToTokens::to_tokens(&where_clause, &mut _s);
::quote::__private::push_ident(&mut _s, "where");
::quote::__private::push_ident(&mut _s, "for");
::quote::__private::push_lt(&mut _s);
::quote::__private::push_lifetime(&mut _s, "\'workaround");
::quote::__private::push_gt(&mut _s);
::quote::ToTokens::to_tokens(&ty, &mut _s);
::quote::ToTokens::to_tokens(&ty_generics, &mut _s);
::quote::__private::push_colon(&mut _s);
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "core");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "fmt");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "Debug");
::quote::__private::push_comma(&mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Brace,
::quote::__private::TokenStream::new());
::quote::__private::push_pound(&mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Bracket,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s, "allow");
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Parenthesis,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s,
"unused_qualifications");
_s
});
_s
});
::quote::__private::push_pound(&mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Bracket,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s, "automatically_derived");
_s
});
::quote::__private::push_ident(&mut _s, "impl");
::quote::ToTokens::to_tokens(&impl_generics, &mut _s);
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "core");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "fmt");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "Display");
::quote::__private::push_ident(&mut _s, "for");
::quote::ToTokens::to_tokens(&ty, &mut _s);
::quote::ToTokens::to_tokens(&ty_generics, &mut _s);
::quote::ToTokens::to_tokens(&where_clause, &mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Brace,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_ident(&mut _s, "fn");
::quote::__private::push_ident(&mut _s, "fmt");
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Parenthesis,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_and(&mut _s);
::quote::__private::push_ident(&mut _s, "self");
::quote::__private::push_comma(&mut _s);
::quote::__private::push_ident(&mut _s, "__formatter");
::quote::__private::push_colon(&mut _s);
::quote::__private::push_and(&mut _s);
::quote::__private::push_ident(&mut _s, "mut");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "core");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "fmt");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "Formatter");
_s
});
::quote::__private::push_rarrow(&mut _s);
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "core");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "fmt");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "Result");
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Brace,
{
let mut _s = ::quote::__private::TokenStream::new();
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "core");
::quote::__private::push_colon2(&mut _s);
::quote::__private::push_ident(&mut _s, "unreachable");
::quote::__private::push_bang(&mut _s);
::quote::__private::push_group(&mut _s,
::quote::__private::Delimiter::Parenthesis,
::quote::__private::TokenStream::new());
_s
});
_s
});
_s
}quote! {
14 #error
15
16 #[allow(unused_qualifications)]
17 #[automatically_derived]
18 impl #impl_generics ::thiserror::#private::Error for #ty #ty_generics #where_clause
19 where
20 for<'workaround> #ty #ty_generics: ::core::fmt::Debug,
23 {}
24
25 #[allow(unused_qualifications)]
26 #[automatically_derived]
27 impl #impl_generics ::core::fmt::Display for #ty #ty_generics #where_clause {
28 fn fmt(&self, __formatter: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
29 ::core::unreachable!()
30 }
31 }
32 }
33}