# Struct rustc_infer::infer::at::Trace

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    pub struct Trace<'a, 'tcx> {
        at: At<'a, 'tcx>,
        a_is_expected: bool,
        trace: TypeTrace<'tcx>,
    }

## Fields§

§`at: At<'a, 'tcx>`§`a_is_expected: bool`§`trace: TypeTrace<'tcx>`

## Implementations§

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### impl<'a, 'tcx> Trace<'a, 'tcx>

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#### pub fn sub<T>( self, define_opaque_types: DefineOpaqueTypes, a: T, b: T ) -> InferResult<'tcx, ()>
where T: Relate<'tcx>,

Makes `a <: b` where `a` may or may not be expected (if `a_is_expected` is true, then `a` is expected).

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#### pub fn eq<T>( self, define_opaque_types: DefineOpaqueTypes, a: T, b: T ) -> InferResult<'tcx, ()>
where T: Relate<'tcx>,

Makes `a == b`; the expectation is set by the call to `trace()`.

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#### pub fn lub<T>( self, define_opaque_types: DefineOpaqueTypes, a: T, b: T ) -> InferResult<'tcx, T>
where T: Relate<'tcx>,

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#### pub fn glb<T>( self, define_opaque_types: DefineOpaqueTypes, a: T, b: T ) -> InferResult<'tcx, T>
where T: Relate<'tcx>,

## Auto Trait Implementations§

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### impl<'a, 'tcx> !RefUnwindSafe for Trace<'a, 'tcx>

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### impl<'a, 'tcx> !Send for Trace<'a, 'tcx>

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### impl<'a, 'tcx> !Sync for Trace<'a, 'tcx>

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### impl<'a, 'tcx> Unpin for Trace<'a, 'tcx>

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### impl<'a, 'tcx> !UnwindSafe for Trace<'a, 'tcx>

## 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: 120 bytes