From b3340b5cea5fdaefa4cbc7eec8ceb0592ebe2255 Mon Sep 17 00:00:00 2001
From: Gary Guo <gary@garyguo.net>
Date: Tue, 21 Jul 2020 02:28:51 +0100
Subject: [PATCH] Expand test to cover type_name and monomorphic use

---
 src/test/ui/consts/issue-73976-monomorphic.rs | 36 +++++++++++++++++++
 ...ue-73976.rs => issue-73976-polymorphic.rs} | 16 ++++++++-
 .../ui/consts/issue-73976-polymorphic.stderr  | 26 ++++++++++++++
 src/test/ui/consts/issue-73976.stderr         | 14 --------
 4 files changed, 77 insertions(+), 15 deletions(-)
 create mode 100644 src/test/ui/consts/issue-73976-monomorphic.rs
 rename src/test/ui/consts/{issue-73976.rs => issue-73976-polymorphic.rs} (62%)
 create mode 100644 src/test/ui/consts/issue-73976-polymorphic.stderr
 delete mode 100644 src/test/ui/consts/issue-73976.stderr

diff --git a/src/test/ui/consts/issue-73976-monomorphic.rs b/src/test/ui/consts/issue-73976-monomorphic.rs
new file mode 100644
index 00000000000..7706a97f23b
--- /dev/null
+++ b/src/test/ui/consts/issue-73976-monomorphic.rs
@@ -0,0 +1,36 @@
+// check-pass
+//
+// This test is complement to the test in issue-73976-polymorphic.rs.
+// In that test we ensure that polymorphic use of type_id and type_name in patterns
+// will be properly rejected. This test will ensure that monomorphic use of these
+// would not be wrongly rejected in patterns.
+
+#![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::<usize>::VALUE)
+}
+
+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::<usize>::VALUE)
+}
+
+fn main() {
+    assert!(check_type_id::<usize>());
+    assert!(check_type_name_len::<usize>());
+}
diff --git a/src/test/ui/consts/issue-73976.rs b/src/test/ui/consts/issue-73976-polymorphic.rs
similarity index 62%
rename from src/test/ui/consts/issue-73976.rs
rename to src/test/ui/consts/issue-73976-polymorphic.rs
index ef141791c2c..28b84518719 100644
--- a/src/test/ui/consts/issue-73976.rs
+++ b/src/test/ui/consts/issue-73976-polymorphic.rs
@@ -6,8 +6,9 @@
 // Currently we just disallow this usage and require pattern is monomorphic.
 
 #![feature(const_type_id)]
+#![feature(const_type_name)]
 
-use std::any::TypeId;
+use std::any::{self, TypeId};
 
 pub struct GetTypeId<T>(T);
 
@@ -21,6 +22,19 @@ const fn check_type_id<T: 'static>() -> bool {
     //~| ERROR could not evaluate constant pattern
 }
 
+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 could not evaluate constant pattern
+    //~| ERROR could not evaluate constant pattern
+}
+
 fn main() {
     assert!(check_type_id::<usize>());
+    assert!(check_type_name_len::<usize>());
 }
diff --git a/src/test/ui/consts/issue-73976-polymorphic.stderr b/src/test/ui/consts/issue-73976-polymorphic.stderr
new file mode 100644
index 00000000000..c90ce2bd06a
--- /dev/null
+++ b/src/test/ui/consts/issue-73976-polymorphic.stderr
@@ -0,0 +1,26 @@
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:20:37
+   |
+LL |     matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
+   |                                     ^^^^^^^^^^^^^^^^^^^^^
+
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:32:42
+   |
+LL |     matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:20:37
+   |
+LL |     matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
+   |                                     ^^^^^^^^^^^^^^^^^^^^^
+
+error: could not evaluate constant pattern
+  --> $DIR/issue-73976-polymorphic.rs:32:42
+   |
+LL |     matches!(GetTypeNameLen::<T>::VALUE, GetTypeNameLen::<T>::VALUE)
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 4 previous errors
+
diff --git a/src/test/ui/consts/issue-73976.stderr b/src/test/ui/consts/issue-73976.stderr
deleted file mode 100644
index dbb7690b849..00000000000
--- a/src/test/ui/consts/issue-73976.stderr
+++ /dev/null
@@ -1,14 +0,0 @@
-error: could not evaluate constant pattern
-  --> $DIR/issue-73976.rs:19:37
-   |
-LL |     matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
-   |                                     ^^^^^^^^^^^^^^^^^^^^^
-
-error: could not evaluate constant pattern
-  --> $DIR/issue-73976.rs:19:37
-   |
-LL |     matches!(GetTypeId::<T>::VALUE, GetTypeId::<T>::VALUE)
-   |                                     ^^^^^^^^^^^^^^^^^^^^^
-
-error: aborting due to 2 previous errors
-