Function rustc_middle::ty::tls::enter_context

pub fn enter_context<'a, 'tcx, F, R>(context: &ImplicitCtxt<'a, 'tcx>, f: F) -> Rwhere
    F: FnOnce(&ImplicitCtxt<'a, 'tcx>) -> R,

Sets context as the new current ImplicitCtxt for the duration of the function f.