Struct Directive 

pub struct Directive {
    pub is_rustc_attr: bool,
    pub condition: Option<OnUnimplementedCondition>,
    pub subcommands: ThinVec<Directive>,
    pub message: Option<(Span, FormatString)>,
    pub label: Option<(Span, FormatString)>,
    pub notes: ThinVec<FormatString>,
    pub parent_label: Option<FormatString>,
    pub append_const_msg: Option<AppendConstMessage>,
}

Fields

is_rustc_attr: bool

condition: Option<OnUnimplementedCondition>

subcommands: ThinVec<Directive>

message: Option<(Span, FormatString)>

label: Option<(Span, FormatString)>

notes: ThinVec<FormatString>

parent_label: Option<FormatString>

append_const_msg: Option<AppendConstMessage>

Implementations

impl Directive

pub fn visit_params(&self, visit: &mut impl FnMut(Symbol, Span))

Visit all the generic arguments used in the attribute, to see whether they are actually a generic of the item. If not then visit must issue a diagnostic.

We can’t check this while parsing the attribute because rustc_attr_parsing doesn’t have access to the item an attribute is on. Instead we later call this function in check_attr.

pub fn evaluate_directive( &self, trait_name: impl Debug, condition_options: &ConditionOptions, args: &FormatArgs, ) -> OnUnimplementedNote

Trait Implementations

impl Clone for Directive

fn clone(&self) -> Directive

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Directive

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<__D: SpanDecoder> Decodable<__D> for Directive

fn decode(__decoder: &mut __D) -> Self

impl Default for Directive

fn default() -> Directive

Returns the “default value” for a type.

impl<__E: SpanEncoder> Encodable<__E> for Directive

fn encode(&self, __encoder: &mut __E)

impl<__CTX> HashStable<__CTX> for Directive

where __CTX: HashStableContext,

fn hash_stable(&self, __hcx: &mut __CTX, __hasher: &mut StableHasher)

impl PrintAttribute for Directive

fn should_render(&self) -> bool

Whether or not this will render as something meaningful, or if it’s skipped (which will force the containing struct to also skip printing a comma and the field name).

fn print_attribute(&self, __p: &mut Printer)

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 144 bytes