7b7061dd89
Type attributes could previously be used to support spanless subdiagnostics but these couldn't easily be made optional in the same way that spanned subdiagnostics could by using a field attribute on a field with an `Option<Span>` type. Spanless subdiagnostics can now be specified on fields with `()` type or `Option<()>` type. Signed-off-by: David Wood <david.wood@huawei.com>
97 lines
2.8 KiB
Rust
97 lines
2.8 KiB
Rust
#![feature(allow_internal_unstable)]
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#![feature(let_else)]
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#![feature(never_type)]
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#![feature(proc_macro_diagnostic)]
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#![allow(rustc::default_hash_types)]
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#![recursion_limit = "128"]
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use synstructure::decl_derive;
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use proc_macro::TokenStream;
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mod diagnostics;
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mod hash_stable;
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mod lift;
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mod newtype;
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mod query;
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mod serialize;
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mod symbols;
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mod type_foldable;
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#[proc_macro]
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pub fn rustc_queries(input: TokenStream) -> TokenStream {
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query::rustc_queries(input)
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}
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#[proc_macro]
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pub fn symbols(input: TokenStream) -> TokenStream {
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symbols::symbols(input.into()).into()
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}
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/// Creates a struct type `S` that can be used as an index with
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/// `IndexVec` and so on.
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///
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/// There are two ways of interacting with these indices:
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///
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/// - The `From` impls are the preferred way. So you can do
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/// `S::from(v)` with a `usize` or `u32`. And you can convert back
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/// to an integer with `u32::from(s)`.
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///
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/// - Alternatively, you can use the methods `S::new(v)` and `s.index()`
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/// to create/return a value.
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///
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/// Internally, the index uses a u32, so the index must not exceed
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/// `u32::MAX`. You can also customize things like the `Debug` impl,
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/// what traits are derived, and so forth via the macro.
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#[proc_macro]
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#[allow_internal_unstable(step_trait, rustc_attrs, trusted_step)]
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pub fn newtype_index(input: TokenStream) -> TokenStream {
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newtype::newtype(input)
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}
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decl_derive!([HashStable, attributes(stable_hasher)] => hash_stable::hash_stable_derive);
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decl_derive!(
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[HashStable_Generic, attributes(stable_hasher)] =>
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hash_stable::hash_stable_generic_derive
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);
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decl_derive!([Decodable] => serialize::decodable_derive);
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decl_derive!([Encodable] => serialize::encodable_derive);
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decl_derive!([TyDecodable] => serialize::type_decodable_derive);
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decl_derive!([TyEncodable] => serialize::type_encodable_derive);
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decl_derive!([MetadataDecodable] => serialize::meta_decodable_derive);
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decl_derive!([MetadataEncodable] => serialize::meta_encodable_derive);
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decl_derive!([TypeFoldable, attributes(type_foldable)] => type_foldable::type_foldable_derive);
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decl_derive!([Lift, attributes(lift)] => lift::lift_derive);
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decl_derive!(
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[SessionDiagnostic, attributes(
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// struct attributes
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warning,
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error,
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note,
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help,
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// field attributes
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skip_arg,
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primary_span,
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label,
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subdiagnostic,
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suggestion,
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suggestion_short,
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suggestion_hidden,
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suggestion_verbose)] => diagnostics::session_diagnostic_derive
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);
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decl_derive!(
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[SessionSubdiagnostic, attributes(
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// struct/variant attributes
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label,
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help,
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note,
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suggestion,
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suggestion_short,
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suggestion_hidden,
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suggestion_verbose,
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// field attributes
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skip_arg,
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primary_span,
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applicability)] => diagnostics::session_subdiagnostic_derive
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);
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