1 files changed, 43 insertions, 0 deletions
diff --git a/tests/ui/static/static-mut-not-pat.rs b/tests/ui/static/static-mut-not-pat.rs
new file mode 100644
index 00000000000..ce5ae164c0e
--- /dev/null
+++ b/tests/ui/static/static-mut-not-pat.rs
@@ -0,0 +1,43 @@
+// Constants (static variables) can be used to match in patterns, but mutable
+// statics cannot. This ensures that there's some form of error if this is
+// attempted.
+
+static mut a: isize = 3;
+
+fn main() {
+    // If they can't be matched against, then it's possible to capture the same
+    // name as a variable, hence this should be an unreachable pattern situation
+    // instead of spitting out a custom error about some identifier collisions
+    // (we should allow shadowing)
+    match 4 {
+        a => {} //~ ERROR match bindings cannot shadow statics
+        _ => {}
+    }
+}
+
+struct NewBool(bool);
+enum Direction {
+    North,
+    East,
+    South,
+    West
+}
+const NEW_FALSE: NewBool = NewBool(false);
+struct Foo {
+    bar: Option<Direction>,
+    baz: NewBool
+}
+
+static mut STATIC_MUT_FOO: Foo = Foo { bar: Some(Direction::West), baz: NEW_FALSE };
+
+fn mutable_statics() {
+    match (Foo { bar: Some(Direction::North), baz: NewBool(true) }) {
+        Foo { bar: None, baz: NewBool(true) } => (),
+        STATIC_MUT_FOO => (),
+        //~^ ERROR match bindings cannot shadow statics
+        Foo { bar: Some(Direction::South), .. } => (),
+        Foo { bar: Some(EAST), .. } => (),
+        Foo { bar: Some(Direction::North), baz: NewBool(true) } => (),
+        Foo { bar: Some(EAST), baz: NewBool(false) } => ()
+    }
+}