1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/const-generics/const-argument-if-length.rs b/tests/ui/const-generics/const-argument-if-length.rs
new file mode 100644
index 00000000000..db1eafca2c7
--- /dev/null
+++ b/tests/ui/const-generics/const-argument-if-length.rs
@@ -0,0 +1,22 @@
+// revisions: full min
+
+#![cfg_attr(full, feature(generic_const_exprs))]
+#![cfg_attr(full, allow(incomplete_features))]
+
+pub const fn is_zst<T: ?Sized>() -> usize {
+    if std::mem::size_of::<T>() == 0 {
+        1
+    } else {
+        0
+    }
+}
+
+pub struct AtLeastByte<T: ?Sized> {
+    value: T,
+    //~^ ERROR the size for values of type `T` cannot be known at compilation time
+    pad: [u8; is_zst::<T>()],
+    //[min]~^ ERROR generic parameters may not be used in const operations
+    //[full]~^^ ERROR unconstrained generic constant
+}
+
+fn main() {}