# Enum rustc_trait_selection::traits::object_safety::MethodViolationCode

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    pub enum MethodViolationCode {
        StaticMethod(Option<((String, Span), (String, Span))>),
        ReferencesSelfInput(Option<Span>),
        ReferencesSelfOutput,
        ReferencesImplTraitInTrait(Span),
        AsyncFn,
        WhereClauseReferencesSelf,
        Generic,
        UndispatchableReceiver(Option<Span>),
    }

Expand description

Reasons a method might not be object-safe.

## Variants§

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### StaticMethod(Option<((String, Span), (String, Span))>)

e.g., `fn foo()`

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### ReferencesSelfInput(Option<Span>)

e.g., `fn foo(&self, x: Self)`

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### ReferencesSelfOutput

e.g., `fn foo(&self) -> Self`

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### ReferencesImplTraitInTrait(Span)

e.g., `fn foo(&self) -> impl Sized`

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### AsyncFn

e.g., `async fn foo(&self)`

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### WhereClauseReferencesSelf

e.g., `fn foo(&self) where Self: Clone`

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### Generic

e.g., `fn foo<A>()`

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### UndispatchableReceiver(Option<Span>)

the method’s receiver (`self` argument) can’t be dispatched on

## Auto Trait Implementations§

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### impl RefUnwindSafe for MethodViolationCode

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### impl Send for MethodViolationCode

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### impl Sync for MethodViolationCode

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### impl Unpin for MethodViolationCode

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### impl UnwindSafe for MethodViolationCode

## 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> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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: 64 bytes

Size for each variant:

- `StaticMethod`: 64 bytes
- `ReferencesSelfInput`: 20 bytes
- `ReferencesSelfOutput`: 0 bytes
- `ReferencesImplTraitInTrait`: 16 bytes
- `AsyncFn`: 0 bytes
- `WhereClauseReferencesSelf`: 0 bytes
- `Generic`: 0 bytes
- `UndispatchableReceiver`: 20 bytes