Trait HasAttrs

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));
}

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

Required Associated Constants

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

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

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

Object Safety

This trait is not object safe.

Implementations on Foreign Types

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

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = T::SUPPORTS_CUSTOM_INNER_ATTRS

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

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

Implementors

impl HasAttrs for StmtKind

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true

impl HasAttrs for Arm

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for AttrItem

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Attribute

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Block

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Crate

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Expr

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for ExprField

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for FieldDef

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for GenericParam

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Item

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true

impl HasAttrs for Param

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Pat

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for PatField

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Path

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Stmt

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true

impl HasAttrs for Ty

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Variant

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for Visibility

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = false

impl HasAttrs for AssocItem

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true

impl HasAttrs for ForeignItem

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = true

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

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