boop, ur abstract consts are now expanded
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@ -609,9 +609,27 @@ where
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/// Tries to unify two abstract constants using structural equality.
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pub(super) fn try_unify<'tcx>(
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tcx: TyCtxt<'tcx>,
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a: AbstractConst<'tcx>,
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b: AbstractConst<'tcx>,
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mut a: AbstractConst<'tcx>,
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mut b: AbstractConst<'tcx>,
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) -> bool {
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while let Node::Leaf(a_ct) = a.root() {
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let a_ct = a_ct.subst(tcx, a.substs);
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match AbstractConst::from_const(tcx, a_ct) {
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Ok(Some(a_act)) => a = a_act,
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Ok(None) => break,
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Err(_) => return true,
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}
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}
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while let Node::Leaf(b_ct) = b.root() {
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let b_ct = b_ct.subst(tcx, b.substs);
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match AbstractConst::from_const(tcx, b_ct) {
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Ok(Some(b_act)) => b = b_act,
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Ok(None) => break,
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Err(_) => return true,
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}
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}
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match (a.root(), b.root()) {
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(Node::Leaf(a_ct), Node::Leaf(b_ct)) => {
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let a_ct = a_ct.subst(tcx, a.substs);
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@ -632,8 +650,6 @@ pub(super) fn try_unify<'tcx>(
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// we do not want to use `assert_eq!(a(), b())` to infer that `N` and `M` have to be `1`. This
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// means that we only allow inference variables if they are equal.
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(ty::ConstKind::Infer(a_val), ty::ConstKind::Infer(b_val)) => a_val == b_val,
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// We may want to instead recurse into unevaluated constants here. That may require some
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// care to prevent infinite recursion, so let's just ignore this for now.
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(
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ty::ConstKind::Unevaluated(a_def, a_substs, None),
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ty::ConstKind::Unevaluated(b_def, b_substs, None),
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@ -0,0 +1,22 @@
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// run-pass
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#![feature(const_generics, const_evaluatable_checked)]
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#![allow(incomplete_features)]
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fn callee<const M2: usize>() -> usize
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where
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[u8; M2 + 1]: Sized,
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{
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M2
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}
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fn caller<const N1: usize>() -> usize
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where
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[u8; N1 + 1]: Sized,
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[u8; (N1 + 1) + 1]: Sized,
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{
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callee::<{ N1 + 1 }>()
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}
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fn main() {
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assert_eq!(caller::<4>(), 5);
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}
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@ -0,0 +1,32 @@
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// run-pass
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#![feature(const_evaluatable_checked, const_generics)]
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#![allow(incomplete_features)]
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struct Generic<const K: u64>;
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struct ConstU64<const K: u64>;
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impl<const K: u64> Generic<K>
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where
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ConstU64<{ K - 1 }>: ,
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{
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fn foo(self) -> u64 {
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K
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}
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}
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impl<const K: u64> Generic<K>
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where
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ConstU64<{ K - 1 }>: ,
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ConstU64<{ K + 1 }>: ,
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ConstU64<{ K + 1 - 1 }>: ,
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{
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fn bar(self) -> u64 {
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let x: Generic<{ K + 1 }> = Generic;
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x.foo()
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}
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}
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fn main() {
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assert_eq!((Generic::<10>).bar(), 11);
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}
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@ -0,0 +1,32 @@
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// run-pass
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#![feature(const_generics, const_evaluatable_checked)]
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#![allow(incomplete_features)]
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fn zero_init<const N: usize>() -> Substs1<N>
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where
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[u8; N + 1]: ,
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{
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Substs1([0; N + 1])
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}
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struct Substs1<const N: usize>([u8; N + 1])
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where
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[(); N + 1]: ;
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fn substs2<const M: usize>() -> Substs1<{ M * 2 }>
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where
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[(); { M * 2 } + 1]: ,
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{
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zero_init::<{ M * 2 }>()
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}
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fn substs3<const L: usize>() -> Substs1<{ (L - 1) * 2 }>
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where
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[(); (L - 1)]: ,
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[(); (L - 1) * 2 + 1]: ,
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{
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substs2::<{ L - 1 }>()
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}
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fn main() {
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assert_eq!(substs3::<2>().0, [0; 3]);
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}
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@ -0,0 +1,26 @@
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// run-pass
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#![feature(const_generics, const_evaluatable_checked)]
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#![allow(incomplete_features, unused_parens, unused_braces)]
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fn zero_init<const N: usize>() -> Substs1<{ (N) }>
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where
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[u8; { (N) }]: ,
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{
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Substs1([0; { (N) }])
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}
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struct Substs1<const N: usize>([u8; { (N) }])
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where
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[(); { (N) }]: ;
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fn substs2<const M: usize>() -> Substs1<{ (M) }> {
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zero_init::<{ (M) }>()
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}
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fn substs3<const L: usize>() -> Substs1<{ (L) }> {
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substs2::<{ (L) }>()
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}
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fn main() {
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assert_eq!(substs3::<2>().0, [0; 2]);
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}
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