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))

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so 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))

impl<T: HasAttrs> HasAttrs for Box<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 WherePredicate

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<Wrapped: HasAttrs, Tag> HasAttrs for AstNodeWrapper<Wrapped, Tag>

const SUPPORTS_CUSTOM_INNER_ATTRS: bool = Wrapped::SUPPORTS_CUSTOM_INNER_ATTRS