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Make builtin derives a SyntaxExtension

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This allows builtin derives to be registered and
resolved, just like other derive types.
This commit is contained in:
Josh Driver 2017-01-24 01:31:49 +10:30
parent eb5cb9545c
commit 0477daf9f0
6 changed files with 34 additions and 24 deletions
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8
src/libsyntax/ext/base.rs
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@ -10,7 +10,7 @@
pub use self::SyntaxExtension::{MultiDecorator, MultiModifier, NormalTT, IdentTT};
use ast::{self, Attribute, Name, PatKind};
use ast::{self, Attribute, Name, PatKind, MetaItem};
use attr::HasAttrs;
use codemap::{self, CodeMap, ExpnInfo, Spanned, respan};
use syntax_pos::{Span, ExpnId, NO_EXPANSION};
@ -471,6 +471,9 @@ impl MacResult for DummyResult {
}
}
pub type BuiltinDeriveFn =
for<'cx> fn(&'cx mut ExtCtxt, Span, &MetaItem, &Annotatable, &mut FnMut(Annotatable));
/// An enum representing the different kinds of syntax extensions.
pub enum SyntaxExtension {
/// A syntax extension that is attached to an item and creates new items
@ -508,6 +511,9 @@ pub enum SyntaxExtension {
IdentTT(Box<IdentMacroExpander>, Option<Span>, bool),
CustomDerive(Box<MultiItemModifier>),
/// An attribute-like procedural macro that derives a builtin trait.
BuiltinDerive(BuiltinDeriveFn),
}
pub type NamedSyntaxExtension = (Name, SyntaxExtension);