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factor 'is this type allowed as union field on stable' into separate function

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This commit is contained in:
Ralf Jung 2022-06-10 21:44:57 -07:00
parent c80dde43f9
commit 848d23b57b
1 changed files with 11 additions and 3 deletions
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14
compiler/rustc_passes/src/stability.rs
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@ -772,13 +772,21 @@ impl<'tcx> Visitor<'tcx> for Checker<'tcx> {
let ty = self.tcx.type_of(item.def_id);
let ty::Adt(adt_def, substs) = ty.kind() else { bug!() };
#[allow(rustc::usage_of_qualified_ty)] // `Ty` is the wrong type here, we really want `ty::Ty`.
fn allowed_union_field<'tcx>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
ty: ty::Ty<'tcx>,
) -> bool {
ty.ty_adt_def().map_or(false, |adt_def| adt_def.is_manually_drop())
|| ty.is_copy_modulo_regions(tcx.at(DUMMY_SP), param_env)
}
// Non-`Copy` fields are unstable, except for `ManuallyDrop`.
let param_env = self.tcx.param_env(item.def_id);
for field in &adt_def.non_enum_variant().fields {
let field_ty = field.ty(self.tcx, substs);
if !field_ty.ty_adt_def().map_or(false, |adt_def| adt_def.is_manually_drop())
&& !field_ty.is_copy_modulo_regions(self.tcx.at(DUMMY_SP), param_env)
{
if !allowed_union_field(self.tcx, param_env, field_ty) {
if field_ty.needs_drop(self.tcx, param_env) {
// Avoid duplicate error: This will error later anyway because fields
// that need drop are not allowed.