Tests for feature(bind_by_move_pattern_guards).

Apparently copyright notices are no longer necessary apparently.
(See #43498 and #53654.)

src/test/ui/rfc-0107-bind-by-move-pattern-guards/rfc-basic-examples.rs

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+#![feature(nll)]
+#![feature(bind_by_move_pattern_guards)]
+
+// compile-pass
+
+struct A { a: Box<i32> }
+
+impl A {
+    fn get(&self) -> i32 { *self.a }
+}
+
+fn foo(n: i32) {
+    let x = A { a: Box::new(n) };
+    let y = match x {
+        A { a: v } if *v == 42 => v,
+        _ => Box::new(0),
+    };
+}
+
+fn bar(n: i32) {
+    let x = A { a: Box::new(n) };
+    let y = match x {
+        A { a: v } if x.get() == 42 => v,
+        _ => Box::new(0),
+    };
+}
+
+fn baz(n: i32) {
+    let x = A { a: Box::new(n) };
+    let y = match x {
+        A { a: v } if *v.clone() == 42 => v,
+        _ => Box::new(0),
+    };
+}
+
+fn main() {
+    foo(107);
+    bar(107);
+    baz(107);
+}