Rework subtrees again and update docs

1 files changed, 12 insertions, 0 deletions

diff --git a/src/parser.rs b/src/parser.rs
index a11b68c..eb378ad 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -877,5 +877,17 @@ mod tests {
         run_pattern(":map->[:str]:str");
         run_pattern(":map(->[:str]:str)()");
     }
+
+    #[test]
+    fn test_documented_edge_cases() {
+        // tests that these patterns parse successfully
+        fn run_pattern(mut s: &str) {
+            let _ = prep_parser(s).pattern(&mut s).unwrap();
+        }
+        // Empty pattern.
+        run_pattern("");
+        // Empty subvalue
+        run_pattern("()");
+    }
 }