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use rustc_middle::traits;
use rustc_middle::ty::adjustment::CustomCoerceUnsized;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_hir::lang_items::LangItem;
pub mod collector;
pub mod partitioning;
pub mod polymorphize;
pub mod util;
fn custom_coerce_unsize_info<'tcx>(
tcx: TyCtxt<'tcx>,
source_ty: Ty<'tcx>,
target_ty: Ty<'tcx>,
) -> CustomCoerceUnsized {
let def_id = tcx.require_lang_item(LangItem::CoerceUnsized, None);
let trait_ref = ty::Binder::dummy(ty::TraitRef {
def_id,
substs: tcx.mk_substs_trait(source_ty, &[target_ty.into()]),
});
match tcx.codegen_fulfill_obligation((ty::ParamEnv::reveal_all(), trait_ref)) {
Ok(traits::ImplSource::UserDefined(traits::ImplSourceUserDefinedData {
impl_def_id,
..
})) => tcx.coerce_unsized_info(impl_def_id).custom_kind.unwrap(),
impl_source => {
bug!("invalid `CoerceUnsized` impl_source: {:?}", impl_source);
}
}
}
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