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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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76
compiler/rustc_mir/src/borrow_check/type_check/mod.rs
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@ -1988,44 +1988,48 @@ 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`.
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) {
let ccx = ConstCx::new_with_param_env(tcx, body, self.param_env);
// To determine if `const_in_array_repeat_expressions` feature gate should
// be mentioned, need to check if the rvalue is promotable.
let should_suggest =
should_suggest_const_in_array_repeat_expressions_attribute(
&ccx, operand,
);
debug!("check_rvalue: should_suggest={:?}", should_suggest);
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) {
let ccx = ConstCx::new_with_param_env(tcx, body, self.param_env);
// To determine if `const_in_array_repeat_expressions` feature gate should
// be mentioned, need to check if the rvalue is promotable.
let should_suggest =
should_suggest_const_in_array_repeat_expressions_attribute(
&ccx, operand,
);
debug!("check_rvalue: should_suggest={:?}", should_suggest);
let def_id = body.source.def_id().expect_local();
self.infcx.report_selection_error(
&traits::Obligation::new(
ObligationCause::new(
span,
self.tcx().hir().local_def_id_to_hir_id(def_id),
traits::ObligationCauseCode::RepeatVec(should_suggest),
),
self.param_env,
ty::Binder::bind(ty::TraitRef::new(
self.tcx().require_lang_item(
LangItem::Copy,
Some(self.last_span),
let def_id = body.source.def_id().expect_local();
self.infcx.report_selection_error(
&traits::Obligation::new(
ObligationCause::new(
span,
self.tcx().hir().local_def_id_to_hir_id(def_id),
traits::ObligationCauseCode::RepeatVec(should_suggest),
),
tcx.mk_substs_trait(ty, &[]),
))
.without_const()
.to_predicate(self.tcx()),
),
&traits::SelectionError::Unimplemented,
false,
false,
);
self.param_env,
ty::Binder::bind(ty::TraitRef::new(
self.tcx().require_lang_item(
LangItem::Copy,
Some(self.last_span),
),
tcx.mk_substs_trait(ty, &[]),
))
.without_const()
.to_predicate(self.tcx()),
),
&traits::SelectionError::Unimplemented,
false,
false,
);
}
}
}
}