Trait rustc_trait_selection::traits::query::dropck_outlives::AtExt

pub trait AtExt<'tcx> {
    pub fn dropck_outlives(
        &self, 
        ty: Ty<'tcx>
    ) -> InferOk<'tcx, Vec<GenericArg<'tcx>>>;
}

Required methods

pub fn dropck_outlives(
    &self,
    ty: Ty<'tcx>
) -> InferOk<'tcx, Vec<GenericArg<'tcx>>>

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Implementors

impl<'cx, 'tcx> AtExt<'tcx> for At<'cx, 'tcx>

pub fn dropck_outlives(
    &self,
    ty: Ty<'tcx>
) -> InferOk<'tcx, Vec<GenericArg<'tcx>>>

Given a type ty of some value being dropped, computes a set of "kinds" (types, regions) that must be outlive the execution of the destructor. These basically correspond to data that the destructor might access. This is used during regionck to impose "outlives" constraints on any lifetimes referenced within.

The rules here are given by the "dropck" RFCs, notably #1238 and #1327. This is a fixed-point computation, where we explore all the data that will be dropped (transitively) when a value of type ty is dropped. For each type T that will be dropped and which has a destructor, we must assume that all the types/regions of T are live during the destructor, unless they are marked with a special attribute (#[may_dangle]).

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