Struct rustc_infer::infer::InferCtxtBuilder

pub struct InferCtxtBuilder<'tcx> {
    tcx: TyCtxt<'tcx>,
    fresh_typeck_results: Option<RefCell<TypeckResults<'tcx>>>,
}

Helper type of a temporary returned by tcx.infer_ctxt(). Necessary because we can't write the following bound: F: for<'b, 'tcx> where 'tcx FnOnce(InferCtxt<'b, 'tcx>).

Fields

tcx: TyCtxt<'tcx>

fresh_typeck_results: Option<RefCell<TypeckResults<'tcx>>>

Implementations

impl<'tcx> InferCtxtBuilder<'tcx>

pub fn with_fresh_in_progress_typeck_results(
    self,
    table_owner: LocalDefId
) -> Self

Used only by rustc_typeck during body type-checking/inference, will initialize in_progress_typeck_results with fresh TypeckResults.

pub fn enter_with_canonical<T, R>(
    &mut self,
    span: Span,
    canonical: &Canonical<'tcx, T>,
    f: impl for<'a> FnOnce(InferCtxt<'a, 'tcx>, T, CanonicalVarValues<'tcx>) -> R
) -> R where
    T: TypeFoldable<'tcx>, 

Given a canonical value C as a starting point, create an inference context that contains each of the bound values within instantiated as a fresh variable. The f closure is invoked with the new infcx, along with the instantiated value V and a substitution S. This substitution S maps from the bound values in C to their instantiated values in V (in other words, S(C) = V).

pub fn enter<R>(
    &mut self,
    f: impl for<'a> FnOnce(InferCtxt<'a, 'tcx>) -> R
) -> R