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Fix incorrect rebase in collector::find_vtable_types

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Maik Klein 2017-12-18 16:14:00 +01:00 committed by Ariel Ben-Yehuda
parent f6fcfa3915
commit c847cf3f5e
1 changed files with 17 additions and 1 deletions
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18
src/librustc_mir/monomorphize/collector.rs
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@ -789,7 +789,23 @@ fn find_vtable_types_for_unsizing<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
target_ty: Ty<'tcx>)
-> (Ty<'tcx>, Ty<'tcx>) {
let ptr_vtable = |inner_source: Ty<'tcx>, inner_target: Ty<'tcx>| {
tcx.struct_lockstep_tails(inner_source, inner_target)
let type_has_metadata = |ty: Ty<'tcx>| -> bool {
use syntax_pos::DUMMY_SP;
if ty.is_sized(tcx, ty::ParamEnv::empty(traits::Reveal::All), DUMMY_SP) {
return false;
}
let tail = tcx.struct_tail(ty);
match tail.sty {
ty::TyForeign(..) => false,
ty::TyStr | ty::TySlice(..) | ty::TyDynamic(..) => true,
_ => bug!("unexpected unsized tail: {:?}", tail.sty),
}
};
if type_has_metadata(inner_source) {
(inner_source, inner_target)
} else {
tcx.struct_lockstep_tails(inner_source, inner_target)
}
};
match (&source_ty.sty, &target_ty.sty) {