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skip reborrows during AbstractConst building

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This commit is contained in:
b-naber 2021-12-02 12:43:36 +01:00
parent 95209252f5
commit 8ff50fe273
1 changed files with 16 additions and 4 deletions
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20
compiler/rustc_trait_selection/src/traits/const_evaluatable.rs
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@ -399,13 +399,25 @@ impl<'a, 'tcx> AbstractConstBuilder<'a, 'tcx> {
let arg = self.recurse_build(source)?;
self.nodes.push(Node::Cast(abstract_const::CastKind::As, arg, node.ty))
}
ExprKind::Borrow{ arg, ..} => {
let arg_node = &self.body.exprs[*arg];
// Skip reborrows for now until we allow Deref/Borrow/AddressOf
// expressions.
// FIXME(generic_const_exprs): Verify/explain why this is sound
if let ExprKind::Deref {arg} = arg_node.kind {
self.recurse_build(arg)?
} else {
self.maybe_supported_error(
node.span,
"borrowing is not supported in generic constants",
)?
}
}
// FIXME(generic_const_exprs): We may want to support these.
ExprKind::AddressOf { .. }
| ExprKind::Borrow { .. }
| ExprKind::Deref { .. } => self.maybe_supported_error(
ExprKind::AddressOf { .. } | ExprKind::Deref {..}=> self.maybe_supported_error(
node.span,
"dereferencing is not supported in generic constants",
"dereferencing or taking the address is not supported in generic constants",
)?,
ExprKind::Repeat { .. } | ExprKind::Array { .. } => self.maybe_supported_error(
node.span,