bjoernager/rust
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use exhaustive match for checking Rvalue::Repeat

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This commit is contained in:
Ralf Jung 2020-11-21 17:42:03 +01:00
parent bd2f1cb278
commit 54a3ed3114
1 changed files with 40 additions and 36 deletions
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10
compiler/rustc_mir/src/borrow_check/type_check/mod.rs
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@ -1988,9 +1988,12 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
// If the length is larger than 1, the repeat expression will need to copy the
// element, so we require the `Copy` trait.
if len.try_eval_usize(tcx, self.param_env).map_or(true, |len| len > 1) {
if let Operand::Move(_) = operand {
// While this is located in `nll::typeck` this error is not an NLL error, it's
// a required check to make sure that repeated elements implement `Copy`.
match operand {
Operand::Copy(..) | Operand::Constant(..) => {
// These are always okay: direct use of a const, or a value that can evidently be copied.
}
Operand::Move(_) => {
// Make sure that repeated elements implement `Copy`.
let span = body.source_info(location).span;
let ty = operand.ty(body, tcx);
if !self.infcx.type_is_copy_modulo_regions(self.param_env, ty, span) {
@ -2030,6 +2033,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}
}
}
Rvalue::NullaryOp(_, ty) => {
// Even with unsized locals cannot box an unsized value.