From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:02:58 +0200
Subject: Adding upstream version 1.64.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/test/ui/consts/issue-79137-toogeneric.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/test/ui/consts/issue-79137-toogeneric.rs

(limited to 'src/test/ui/consts/issue-79137-toogeneric.rs')

diff --git a/src/test/ui/consts/issue-79137-toogeneric.rs b/src/test/ui/consts/issue-79137-toogeneric.rs
new file mode 100644
index 000000000..456035458
--- /dev/null
+++ b/src/test/ui/consts/issue-79137-toogeneric.rs
@@ -0,0 +1,19 @@
+// Test that `variant_count` only gets evaluated once the type is concrete enough.
+
+#![feature(variant_count)]
+
+pub struct GetVariantCount<T>(T);
+
+impl<T> GetVariantCount<T> {
+    pub const VALUE: usize = std::mem::variant_count::<T>();
+}
+
+const fn check_variant_count<T>() -> bool {
+    matches!(GetVariantCount::<T>::VALUE, GetVariantCount::<T>::VALUE)
+    //~^ ERROR constant pattern depends on a generic parameter
+    //~| ERROR constant pattern depends on a generic parameter
+}
+
+fn main() {
+    assert!(check_variant_count::<Option<()>>());
+}
-- 
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