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Relax restrictions for copy operands
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@ -214,7 +214,8 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
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fn visit_operand(&mut self, operand: &Operand<'tcx>, location: Location) {
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// This check is somewhat expensive, so only run it when -Zvalidate-mir is passed.
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if self.tcx.sess.opts.debugging_opts.validate_mir {
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if self.tcx.sess.opts.debugging_opts.validate_mir && self.mir_phase < MirPhase::DropsLowered
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{
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// `Operand::Copy` is only supposed to be used with `Copy` types.
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if let Operand::Copy(place) = operand {
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let ty = place.ty(&self.body.local_decls, self.tcx).ty;
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@ -166,7 +166,8 @@ pub enum MirPhase {
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/// * [`StatementKind::Retag`]
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///
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/// Furthermore, `Drop` now uses explicit drop flags visible in the MIR and reaching a `Drop`
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/// terminator means that the auto-generated drop glue will be invoked.
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/// terminator means that the auto-generated drop glue will be invoked. Also, `Copy` operands
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/// are allowed for non-`Copy` types.
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DropsLowered = 3,
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/// Beginning with this phase, the following variant is disallowed:
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/// * [`Rvalue::Aggregate`] for any `AggregateKind` except `Array`
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@ -2330,7 +2331,10 @@ pub struct SourceScopeLocalData {
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/// validator.
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#[derive(Clone, PartialEq, TyEncodable, TyDecodable, Hash, HashStable)]
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pub enum Operand<'tcx> {
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/// Creates a value by loading the given place. The type of the place must be `Copy`
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/// Creates a value by loading the given place.
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///
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/// Before drop elaboration, the type of the place must be `Copy`. After drop elaboration there
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/// is no such requirement.
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Copy(Place<'tcx>),
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/// Creates a value by performing loading the place, just like the `Copy` operand.
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