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-rw-r--r--src/test/ui/associated-consts/defaults-cyclic-fail.rs17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/associated-consts/defaults-cyclic-fail.rs b/src/test/ui/associated-consts/defaults-cyclic-fail.rs
new file mode 100644
index 000000000..a1c6840a0
--- /dev/null
+++ b/src/test/ui/associated-consts/defaults-cyclic-fail.rs
@@ -0,0 +1,17 @@
+// build-fail
+
+// Cyclic assoc. const defaults don't error unless *used*
+trait Tr {
+ const A: u8 = Self::B;
+ //~^ cycle detected when const-evaluating + checking `Tr::A`
+
+ const B: u8 = Self::A;
+}
+
+// This impl is *allowed* unless its assoc. consts are used
+impl Tr for () {}
+
+fn main() {
+ // This triggers the cycle error
+ assert_eq!(<() as Tr>::A, 0);
+}