pub trait HasAttrs {
    const SUPPORTS_CUSTOM_INNER_ATTRS: bool;

    // Required methods
    fn attrs(&self) -> &[Attribute];
    fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec));
}
Expand description

A trait for AST nodes having (or not having) attributes.

Required Associated Constants§

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const SUPPORTS_CUSTOM_INNER_ATTRS: bool

This is true if this HasAttrs might support ‘custom’ (proc-macro) inner attributes. Attributes like #![cfg] and #![cfg_attr] are not considered ‘custom’ attributes.

If this is false, then this HasAttrs definitely does not support ‘custom’ inner attributes, which enables some optimizations during token collection.

Required Methods§

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fn attrs(&self) -> &[Attribute]

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fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl<T: HasAttrs> HasAttrs for Option<T>

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const SUPPORTS_CUSTOM_INNER_ATTRS: bool = T::SUPPORTS_CUSTOM_INNER_ATTRS

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fn attrs(&self) -> &[Attribute]

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fn visit_attrs(&mut self, f: impl FnOnce(&mut AttrVec))

Implementors§

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impl HasAttrs for StmtKind

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impl HasAttrs for Arm

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impl HasAttrs for AttrItem

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impl HasAttrs for Attribute

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impl HasAttrs for Block

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impl HasAttrs for Crate

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impl HasAttrs for Expr

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impl HasAttrs for ExprField

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impl HasAttrs for FieldDef

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impl HasAttrs for GenericParam

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impl HasAttrs for Item

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impl HasAttrs for Param

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impl HasAttrs for Pat

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impl HasAttrs for PatField

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impl HasAttrs for Path

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impl HasAttrs for Stmt

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impl HasAttrs for Ty

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impl HasAttrs for Variant

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impl HasAttrs for Visibility

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impl HasAttrs for AssocItem

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impl HasAttrs for ForeignItem

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impl<T: AstDeref<Target: HasAttrs>> HasAttrs for T

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const SUPPORTS_CUSTOM_INNER_ATTRS: bool = <T::Target>::SUPPORTS_CUSTOM_INNER_ATTRS