add test for let-bindings
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@ -1693,25 +1693,27 @@ pub fn const_evaluatable_predicates_of<'tcx>(
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) -> impl Iterator<Item = (ty::Predicate<'tcx>, Span)> {
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#[derive(Default)]
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struct ConstCollector<'tcx> {
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ct: SmallVec<[(ty::WithOptConstParam<DefId>, SubstsRef<'tcx>); 4]>,
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ct: SmallVec<[(ty::WithOptConstParam<DefId>, SubstsRef<'tcx>, Span); 4]>,
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curr_span: Span,
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}
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impl<'tcx> TypeVisitor<'tcx> for ConstCollector<'tcx> {
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fn visit_const(&mut self, ct: &'tcx Const<'tcx>) -> bool {
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if let ty::ConstKind::Unevaluated(def, substs, None) = ct.val {
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self.ct.push((def, substs));
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self.ct.push((def, substs, self.curr_span));
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}
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false
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}
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}
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let mut collector = ConstCollector::default();
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for (pred, _span) in predicates.predicates.iter() {
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for &(pred, span) in predicates.predicates.iter() {
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collector.curr_span = span;
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pred.visit_with(&mut collector);
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}
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warn!("const_evaluatable_predicates_of({:?}) = {:?}", def_id, collector.ct);
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collector.ct.into_iter().map(move |(def_id, subst)| {
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(ty::PredicateAtom::ConstEvaluatable(def_id, subst).to_predicate(tcx), DUMMY_SP)
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collector.ct.into_iter().map(move |(def_id, subst, span)| {
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(ty::PredicateAtom::ConstEvaluatable(def_id, subst).to_predicate(tcx), span)
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})
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}
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@ -0,0 +1,15 @@
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#![feature(const_generics, const_evaluatable_checked)]
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#![allow(incomplete_features)]
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// We do not yet want to support let-bindings in abstract consts,
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// so this test should keep failing for now.
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fn test<const N: usize>() -> [u8; { let x = N; N + 1 }] where [u8; { let x = N; N + 1 }]: Default {
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//~^ ERROR constant expression depends
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//~| ERROR constant expression depends
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Default::default()
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}
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fn main() {
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let x = test::<31>();
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assert_eq!(x, [0; 32]);
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}
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@ -0,0 +1,18 @@
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error: constant expression depends on a generic parameter
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--> $DIR/let-bindings.rs:6:91
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LL | fn test<const N: usize>() -> [u8; { let x = N; N + 1 }] where [u8; { let x = N; N + 1 }]: Default {
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| ^^^^^^^ required by this bound in `test::{{constant}}#0`
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= note: this may fail depending on what value the parameter takes
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error: constant expression depends on a generic parameter
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--> $DIR/let-bindings.rs:6:30
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LL | fn test<const N: usize>() -> [u8; { let x = N; N + 1 }] where [u8; { let x = N; N + 1 }]: Default {
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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= note: this may fail depending on what value the parameter takes
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error: aborting due to 2 previous errors
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