# Struct rustc_trait_selection::traits::error_reporting::on_unimplemented::OnUnimplementedDirective

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    pub struct OnUnimplementedDirective {
        pub condition: Option<MetaItem>,
        pub subcommands: Vec<OnUnimplementedDirective>,
        pub message: Option<OnUnimplementedFormatString>,
        pub label: Option<OnUnimplementedFormatString>,
        pub notes: Vec<OnUnimplementedFormatString>,
        pub parent_label: Option<OnUnimplementedFormatString>,
        pub append_const_msg: Option<AppendConstMessage>,
    }

## Fields§

§`condition: Option<MetaItem>`§`subcommands: Vec<OnUnimplementedDirective>`§`message: Option<OnUnimplementedFormatString>`§`label: Option<OnUnimplementedFormatString>`§`notes: Vec<OnUnimplementedFormatString>`§`parent_label: Option<OnUnimplementedFormatString>`§`append_const_msg: Option<AppendConstMessage>`

## Implementations§

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### impl<'tcx> OnUnimplementedDirective

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#### fn parse( tcx: TyCtxt<'tcx>, item_def_id: DefId, items: &[NestedMetaItem], span: Span, is_root: bool, is_diagnostic_namespace_variant: bool ) -> Result<Option<Self>, ErrorGuaranteed>

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#### pub fn of_item( tcx: TyCtxt<'tcx>, item_def_id: DefId ) -> Result<Option<Self>, ErrorGuaranteed>

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#### fn parse_attribute( attr: &Attribute, is_diagnostic_namespace_variant: bool, tcx: TyCtxt<'tcx>, item_def_id: DefId ) -> Result<Option<Self>, ErrorGuaranteed>

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#### pub fn evaluate( &self, tcx: TyCtxt<'tcx>, trait_ref: TraitRef<'tcx>, options: &[(Symbol, Option<String>)] ) -> OnUnimplementedNote

## Trait Implementations§

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### impl Debug for OnUnimplementedDirective

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl !RefUnwindSafe for OnUnimplementedDirective

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### impl !Send for OnUnimplementedDirective

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### impl !Sync for OnUnimplementedDirective

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### impl Unpin for OnUnimplementedDirective

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### impl !UnwindSafe for OnUnimplementedDirective

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.

## 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: 184 bytes