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

A temporary returned by tcx.infer_ctxt(). This is necessary for multiple InferCtxt to share the same in_progress_typeck_results without using Rc or something similar.

Fields

tcx: TyCtxt<'tcx>fresh_typeck_results: Option<RefCell<TypeckResults<'tcx>>>defining_use_anchor: Option<LocalDefId>

Implementations

Used only by rustc_typeck during body type-checking/inference, will initialize in_progress_typeck_results with fresh TypeckResults. Will also change the scope for opaque type defining use checks to the given owner.

Whenever the InferCtxt should be able to handle defining uses of opaque types, you need to call this function. Otherwise the opaque type will be treated opaquely.

It is only meant to be called in two places, for typeck (via with_fresh_in_progress_typeck_results) and for the inference context used in mir borrowck.

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).

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion 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: 648 bytes