Struct rustc_infer::infer::at::At
source · pub struct At<'a, 'tcx> {
pub infcx: &'a InferCtxt<'tcx>,
pub cause: &'a ObligationCause<'tcx>,
pub param_env: ParamEnv<'tcx>,
}
Fields§
§infcx: &'a InferCtxt<'tcx>
§cause: &'a ObligationCause<'tcx>
§param_env: ParamEnv<'tcx>
Implementations§
source§impl<'a, 'tcx> At<'a, 'tcx>
impl<'a, 'tcx> At<'a, 'tcx>
sourcepub fn sub_exp<T>(
self,
define_opaque_types: DefineOpaqueTypes,
a_is_expected: bool,
a: T,
b: T
) -> InferResult<'tcx, ()>where
T: ToTrace<'tcx>,
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>
sourcepub fn sup<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T
) -> InferResult<'tcx, ()>where
T: ToTrace<'tcx>,
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>
sourcepub fn sub<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T
) -> InferResult<'tcx, ()>where
T: ToTrace<'tcx>,
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>
sourcepub fn eq_exp<T>(
self,
define_opaque_types: DefineOpaqueTypes,
a_is_expected: bool,
a: T,
b: T
) -> InferResult<'tcx, ()>where
T: ToTrace<'tcx>,
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>
sourcepub fn eq<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T
) -> InferResult<'tcx, ()>where
T: ToTrace<'tcx>,
pub fn eq<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, actual: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,
pub fn relate<T>( self, define_opaque_types: DefineOpaqueTypes, expected: T, variance: Variance, actual: T ) -> InferResult<'tcx, ()>where T: ToTrace<'tcx>,
sourcepub fn lub<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T
) -> InferResult<'tcx, T>where
T: ToTrace<'tcx>,
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>
sourcepub fn glb<T>(
self,
define_opaque_types: DefineOpaqueTypes,
expected: T,
actual: T
) -> InferResult<'tcx, T>where
T: ToTrace<'tcx>,
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>
sourcepub fn trace<T>(self, expected: T, actual: T) -> Trace<'a, 'tcx>where
T: ToTrace<'tcx>,
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).
Trait Implementations§
Auto Trait Implementations§
impl<'a, 'tcx> !RefUnwindSafe for At<'a, 'tcx>
impl<'a, 'tcx> !Send for At<'a, 'tcx>
impl<'a, 'tcx> !Sync for At<'a, 'tcx>
impl<'a, 'tcx> Unpin for At<'a, 'tcx>
impl<'a, 'tcx> !UnwindSafe for At<'a, 'tcx>
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
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