Add test related to the ICE

This test doesn't reproduce the ICE since it only happens, when the macro is defined in another file.
Currently we can't add tests with multiple files AFAIK

Also using the auxiliary folder didn't help

tests/ui/matches.rs

@@ -150,4 +150,29 @@ fn match_as_ref() {
     };
 }
 
-fn main() {}
+macro_rules! foo_variant(
+    ($idx:expr) => (Foo::get($idx).unwrap())
+);
+
+enum Foo {
+    A,
+    B,
+}
+
+impl Foo {
+    fn get(idx: u8) -> Option<&'static Self> {
+        match idx {
+            0 => Some(&Foo::A),
+            1 => Some(&Foo::B),
+            _ => None,
+        }
+    }
+}
+
+fn main() {
+    // ICE #3719
+    match foo_variant!(0) {
+        &Foo::A => println!("A"),
+        _ => println!("Wild"),
+    }
+}

tests/ui/matches.stderr

@@ -278,5 +278,19 @@ LL | |         Some(ref mut v) => Some(v),
 LL | |     };
    | |_____^ help: try this: `mut_owned.as_mut()`
 
-error: aborting due to 19 previous errors
+error: you don't need to add `&` to all patterns
+  --> $DIR/matches.rs:174:5
+   |
+LL | /     match foo_variant!(0) {
+LL | |         &Foo::A => println!("A"),
+LL | |         _ => println!("Wild"),
+LL | |     }
+   | |_____^
+help: instead of prefixing all patterns with `&`, you can dereference the expression
+   |
+LL |     match *foo_variant!(0) {
+LL |         Foo::A => println!("A"),
+   |
+
+error: aborting due to 20 previous errors