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-rw-r--r--src/test/ui/static/static-mut-not-pat.rs43
1 files changed, 43 insertions, 0 deletions
diff --git a/src/test/ui/static/static-mut-not-pat.rs b/src/test/ui/static/static-mut-not-pat.rs
new file mode 100644
index 000000000..ce5ae164c
--- /dev/null
+++ b/src/test/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) } => ()
+ }
+}