diff --git a/src/test/ui/rfc-2632-const-trait-impl/tilde-twice.rs b/src/test/ui/rfc-2632-const-trait-impl/tilde-twice.rs
new file mode 100644
index 00000000000..06e4ede8b5e
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/tilde-twice.rs
@@ -0,0 +1,6 @@
+// compile-flags: -Z parse-only
+
+#![feature(const_trait_impl)]
+
+struct S<T: ~const ~const Tr>;
+//~^ ERROR expected identifier, found `~`
diff --git a/src/test/ui/rfc-2632-const-trait-impl/tilde-twice.stderr b/src/test/ui/rfc-2632-const-trait-impl/tilde-twice.stderr
new file mode 100644
index 00000000000..928d23e8a42
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/tilde-twice.stderr
@@ -0,0 +1,8 @@
+error: expected identifier, found `~`
+  --> $DIR/tilde-twice.rs:5:20
+   |
+LL | struct S<T: ~const ~const Tr>;
+   |                    ^ expected identifier
+
+error: aborting due to previous error
+
diff --git a/src/test/ui/rfc-2632-const-trait-impl/without-tilde.rs b/src/test/ui/rfc-2632-const-trait-impl/without-tilde.rs
new file mode 100644
index 00000000000..96ba393bd85
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/without-tilde.rs
@@ -0,0 +1,6 @@
+// compiler-flags: -Z parse-only
+
+#![feature(const_trait_impl)]
+
+struct S<T: const Tr>;
+//~^ ERROR expected one of `!`, `(`, `,`, `=`, `>`, `?`, `for`, `~`, lifetime, or path
diff --git a/src/test/ui/rfc-2632-const-trait-impl/without-tilde.stderr b/src/test/ui/rfc-2632-const-trait-impl/without-tilde.stderr
new file mode 100644
index 00000000000..b6b77ac4a2f
--- /dev/null
+++ b/src/test/ui/rfc-2632-const-trait-impl/without-tilde.stderr
@@ -0,0 +1,8 @@
+error: expected one of `!`, `(`, `,`, `=`, `>`, `?`, `for`, `~`, lifetime, or path, found keyword `const`
+  --> $DIR/without-tilde.rs:5:13
+   |
+LL | struct S<T: const Tr>;
+   |             ^^^^^ expected one of 10 possible tokens
+
+error: aborting due to previous error
+