bjoernager/rust
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Ban custom inner attributes in expressions and statements

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This commit is contained in:
Aaron Hill 2021-03-01 16:02:09 -05:00
parent cb473c2c5b
commit fe60f19f7e
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GPG key ID: B4087E510E98B164
5 changed files with 246 additions and 162 deletions
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20
compiler/rustc_expand/src/expand.rs
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@ -206,30 +206,36 @@ ast_fragments! {
}
}
pub enum SupportsMacroExpansion {
No,
Yes { supports_inner_attrs: bool },
}
impl AstFragmentKind {
crate fn dummy(self, span: Span) -> AstFragment {
self.make_from(DummyResult::any(span)).expect("couldn't create a dummy AST fragment")
}
/// Fragment supports macro expansion and not just inert attributes, `cfg` and `cfg_attr`.
pub fn supports_macro_expansion(self) -> bool {
pub fn supports_macro_expansion(self) -> SupportsMacroExpansion {
match self {
AstFragmentKind::OptExpr
| AstFragmentKind::Expr
| AstFragmentKind::Pat
| AstFragmentKind::Ty
| AstFragmentKind::Stmts
| AstFragmentKind::Items
| AstFragmentKind::Ty
| AstFragmentKind::Pat => SupportsMacroExpansion::Yes { supports_inner_attrs: false },
AstFragmentKind::Items
| AstFragmentKind::TraitItems
| AstFragmentKind::ImplItems
| AstFragmentKind::ForeignItems => true,
| AstFragmentKind::ForeignItems => {
SupportsMacroExpansion::Yes { supports_inner_attrs: true }
}
AstFragmentKind::Arms
| AstFragmentKind::Fields
| AstFragmentKind::FieldPats
| AstFragmentKind::GenericParams
| AstFragmentKind::Params
| AstFragmentKind::StructFields
| AstFragmentKind::Variants => false,
| AstFragmentKind::Variants => SupportsMacroExpansion::No,
}
}