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Remove NullOp::Box

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This commit is contained in:
Gary Guo 2021-09-26 17:38:05 +01:00
parent 6162529a01
commit 1b7f5a3818
11 changed files with 2 additions and 92 deletions
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14
compiler/rustc_mir_dataflow/src/move_paths/builder.rs
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@ -343,19 +343,7 @@ impl<'b, 'a, 'tcx> Gatherer<'b, 'a, 'tcx> {
| Rvalue::AddressOf(..)
| Rvalue::Discriminant(..)
| Rvalue::Len(..)
| Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _)
| Rvalue::NullaryOp(NullOp::Box, _) => {
// This returns an rvalue with uninitialized contents. We can't
// move out of it here because it is an rvalue - assignments always
// completely initialize their place.
//
// However, this does not matter - MIR building is careful to
// only emit a shallow free for the partially-initialized
// temporary.
//
// In any case, if we want to fix this, we have to register a
// special move and change the `statement_effect` functions.
}
| Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _) => {}
}
}