Add mbe lifetime split test

crates/ra_mbe/src/tests.rs

@@ -214,6 +214,33 @@ SUBTREE $
     );
 }
 
+#[test]
+fn test_lifetime_split() {
+    parse_macro(
+        r#"
+macro_rules! foo {
+    ($($t:tt)*) => { $($t)*}
+}
+"#,
+    )
+    .assert_expand(
+        r#"foo!(static bar: &'static str = "hello";);"#,
+        r#"
+SUBTREE $
+  IDENT   static 17
+  IDENT   bar 18
+  PUNCH   : [alone] 19
+  PUNCH   & [alone] 20
+  PUNCH   ' [joint] 21
+  IDENT   static 22
+  IDENT   str 23
+  PUNCH   = [alone] 24
+  LITERAL "hello" 25
+  PUNCH   ; [joint] 26
+"#,
+    );
+}
+
 #[test]
 fn test_expr_order() {
     let expanded = parse_macro(