From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:13 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tests/ui/consts/issue-73976-polymorphic.rs | 40 ++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 tests/ui/consts/issue-73976-polymorphic.rs

(limited to 'tests/ui/consts/issue-73976-polymorphic.rs')

diff --git a/tests/ui/consts/issue-73976-polymorphic.rs b/tests/ui/consts/issue-73976-polymorphic.rs
new file mode 100644
index 000000000..787462da9
--- /dev/null
+++ b/tests/ui/consts/issue-73976-polymorphic.rs
@@ -0,0 +1,40 @@
+// This test is from #73976. We previously did not check if a type is monomorphized
+// before calculating its type id, which leads to the bizarre behaviour below that
+// TypeId of a generic type does not match itself.
+//
+// This test case should either run-pass or be rejected at compile time.
+// Currently we just disallow this usage and require pattern is monomorphic.
+
+#![feature(const_type_id)]
+#![feature(const_type_name)]
+
+use std::any::{self, TypeId};
+
+pub struct GetTypeId<T>(T);
+
+impl<T: 'static> GetTypeId<T> {
+    pub const VALUE: TypeId = TypeId::of::<T>();
+}
+
+const fn check_type_id<T: 'static>() -> bool {
+    matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
+    //~^ ERROR constant pattern depends on a generic parameter
+    //~| ERROR constant pattern depends on a generic parameter
+}
+
+pub struct GetTypeNameLen<T>(T);
+
+impl<T: 'static> GetTypeNameLen<T> {
+    pub const VALUE: usize = any::type_name::<T>().len();
+}
+
+const fn check_type_name_len<T: 'static>() -> bool {
+    matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
+    //~^ ERROR constant pattern depends on a generic parameter
+    //~| ERROR constant pattern depends on a generic parameter
+}
+
+fn main() {
+    assert!(check_type_id::<usize>());
+    assert!(check_type_name_len::<usize>());
+}
-- 
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