trait InferCtxtExt<'tcx> {
fn replace_free_regions_with_nll_infer_vars<T>(
&self,
origin: NllRegionVariableOrigin,
value: T
) -> T
where
T: TypeFoldable<'tcx>;
fn replace_bound_regions_with_nll_infer_vars<T>(
&self,
origin: NllRegionVariableOrigin,
all_outlive_scope: LocalDefId,
value: Binder<'tcx, T>,
indices: &mut UniversalRegionIndices<'tcx>
) -> T
where
T: TypeFoldable<'tcx>;
fn replace_late_bound_regions_with_nll_infer_vars_in_recursive_scope(
&self,
mir_def_id: LocalDefId,
indices: &mut UniversalRegionIndices<'tcx>
);
fn replace_late_bound_regions_with_nll_infer_vars_in_item(
&self,
mir_def_id: LocalDefId,
indices: &mut UniversalRegionIndices<'tcx>
);
}
Required Methods§
fn replace_free_regions_with_nll_infer_vars<T>(
&self,
origin: NllRegionVariableOrigin,
value: T
) -> Twhere
T: TypeFoldable<'tcx>,
fn replace_bound_regions_with_nll_infer_vars<T>(
&self,
origin: NllRegionVariableOrigin,
all_outlive_scope: LocalDefId,
value: Binder<'tcx, T>,
indices: &mut UniversalRegionIndices<'tcx>
) -> Twhere
T: TypeFoldable<'tcx>,
fn replace_late_bound_regions_with_nll_infer_vars_in_recursive_scope(
&self,
mir_def_id: LocalDefId,
indices: &mut UniversalRegionIndices<'tcx>
)
fn replace_late_bound_regions_with_nll_infer_vars_in_item(
&self,
mir_def_id: LocalDefId,
indices: &mut UniversalRegionIndices<'tcx>
)
Implementations on Foreign Types§
source§impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx>
impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx>
source§fn replace_late_bound_regions_with_nll_infer_vars_in_recursive_scope(
&self,
mir_def_id: LocalDefId,
indices: &mut UniversalRegionIndices<'tcx>
)
fn replace_late_bound_regions_with_nll_infer_vars_in_recursive_scope(
&self,
mir_def_id: LocalDefId,
indices: &mut UniversalRegionIndices<'tcx>
)
Finds late-bound regions that do not appear in the parameter listing and adds them to the indices vector. Typically, we identify late-bound regions as we process the inputs and outputs of the closure/function. However, sometimes there are late-bound regions which do not appear in the fn parameters but which are nonetheless in scope. The simplest case of this are unused functions, like fn foo<’a>() { } (see e.g., #51351). Despite not being used, users can still reference these regions (e.g., let x: &’a u32 = &22;), so we need to create entries for them and store them in the indices map. This code iterates over the complete set of late-bound regions and checks for any that we have not yet seen, adding them to the inputs vector.