Crate rustc_macros

Macros

current_rustc_version

rustc_queries

symbols

Attribute Macros

extension

Derive an extension trait for a given impl block. The trait name goes into the parenthesized args of the macro, for greppability. For example:

Derive Macros

Decodable

Decodable_NoContext

Diagnostic

Encodable

Encodable_NoContext

HashStable

HashStable_Generic

HashStable_NoContext

HashStable implementation that has no HashStableContext bound and which adds where bounds for HashStable based off of fields and not generics. This is suitable for use in crates like rustc_type_ir.

Lift

LintDiagnostic

MetadataDecodable

MetadataEncodable

PrintAttribute

Derives PrintAttribute for AttributeKind. This macro is pretty specific to rustc_attr_data_structures and likely not that useful in other places. It’s deriving something close to Debug without printing some extraenous things like spans.

Subdiagnostic

TryFromU32

Derives TryFrom<u32> for the annotated enum, which must have no fields. Each variant maps to the value it would produce under an as u32 cast.

TyDecodable

TyEncodable

TypeFoldable

Derives TypeFoldable for the annotated struct or enum (union is not supported).

TypeVisitable

Derives TypeVisitable for the annotated struct or enum (union is not supported).