Struct rustc_infer::infer::at::At

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pub struct At<'a, 'tcx> {
    pub infcx: &'a InferCtxt<'tcx>,
    pub cause: &'a ObligationCause<'tcx>,
    pub param_env: ParamEnv<'tcx>,
}

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§infcx: &'a InferCtxt<'tcx>§cause: &'a ObligationCause<'tcx>§param_env: ParamEnv<'tcx>

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impl<'a, 'tcx> At<'a, 'tcx>

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pub fn sub_exp<T>( self, define_opaque_types: DefineOpaqueTypes, a_is_expected: bool, a: T, b: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,

Makes a <: b, where a may or may not be expected.

See At::trace_exp and Trace::sub for a version of this method that only requires T: Relate<'tcx>

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pub fn sup<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,

Makes actual <: expected. For example, if type-checking a call like foo(x), where foo: fn(i32), you might have sup(i32, x), since the “expected” type is the type that appears in the signature.

See At::trace and Trace::sub for a version of this method that only requires T: Relate<'tcx>

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pub fn sub<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,

Makes expected <: actual.

See At::trace and Trace::sub for a version of this method that only requires T: Relate<'tcx>

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pub fn eq_exp<T>( self, define_opaque_types: DefineOpaqueTypes, a_is_expected: bool, a: T, b: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,

Makes expected <: actual.

See At::trace_exp and Trace::eq for a version of this method that only requires T: Relate<'tcx>

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pub fn eq<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,

Makes expected <: actual.

See At::trace and Trace::eq for a version of this method that only requires T: Relate<'tcx>

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pub fn relate<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, variance: Variance, actual: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,

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pub fn lub<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, T>where T: ToTrace<'tcx>,

Computes the least-upper-bound, or mutual supertype, of two values. The order of the arguments doesn’t matter, but since this can result in an error (e.g., if asked to compute LUB of u32 and i32), it is meaningful to call one of them the “expected type”.

See At::trace and Trace::lub for a version of this method that only requires T: Relate<'tcx>

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pub fn glb<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, T>where T: ToTrace<'tcx>,

Computes the greatest-lower-bound, or mutual subtype, of two values. As with lub order doesn’t matter, except for error cases.

See At::trace and Trace::glb for a version of this method that only requires T: Relate<'tcx>

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pub fn trace<T>(self, expected: T, actual: T) -> Trace<'a, 'tcx>where T: ToTrace<'tcx>,

Sets the “trace” values that will be used for error-reporting, but doesn’t actually perform any operation yet (this is useful when you want to set the trace using distinct values from those you wish to operate upon).

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pub fn trace_exp<T>(self, a_is_expected: bool, a: T, b: T) -> Trace<'a, 'tcx>where T: ToTrace<'tcx>,

Like trace, but the expected value is determined by the boolean argument (if true, then the first argument a is the “expected” value).

Trait Implementations§

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impl<'a, 'tcx> Clone for At<'a, 'tcx>

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fn clone(&self) -> At<'a, 'tcx>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'a, 'tcx> Copy for At<'a, 'tcx>

Auto Trait Implementations§

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impl<'a, 'tcx> !RefUnwindSafe for At<'a, 'tcx>

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impl<'a, 'tcx> !Send for At<'a, 'tcx>

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impl<'a, 'tcx> !Sync for At<'a, 'tcx>

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impl<'a, 'tcx> Unpin for At<'a, 'tcx>

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impl<'a, 'tcx> !UnwindSafe for At<'a, 'tcx>

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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 Twhere 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: 24 bytes