1 files changed, 36 insertions, 0 deletions

diff --git a/crates/ra_syntax/src/ast/traits.rs b/crates/ra_syntax/src/ast/traits.rs
index a8f2454fd..323d78bbc 100644
--- a/crates/ra_syntax/src/ast/traits.rs
+++ b/crates/ra_syntax/src/ast/traits.rs
@@ -146,3 +146,39 @@ impl Iterator for CommentIter {
         self.iter.by_ref().find_map(|el| el.into_token().and_then(ast::Comment::cast))
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use comrak::{parse_document,format_commonmark, ComrakOptions, Arena};
+    use comrak::nodes::{AstNode, NodeValue};
+
+    fn iter_nodes<'a, F>(node: &'a AstNode<'a>, f: &F)
+        where F : Fn(&'a AstNode<'a>) {
+        f(node);
+        for c in node.children() {
+            iter_nodes(c, f);
+        }
+    }
+
+    #[allow(non_snake_case)]
+    #[test]
+    fn test_link_rewrite() {
+        let src = include_str!("./test.txt");
+
+        let arena = Arena::new();
+        let doc = parse_document(&arena, src, &ComrakOptions::default());
+
+        iter_nodes(doc, &|node| {
+            match &mut node.data.borrow_mut().value {
+                &mut NodeValue::Link(ref mut link) => {
+                    link.url = "https://www.google.com".as_bytes().to_vec();
+                },
+                _ => ()
+            }
+        });
+
+        let mut out = Vec::new();
+        format_commonmark(doc, &ComrakOptions::default(), &mut out);
+        panic!("{}", String::from_utf8(out).unwrap());
+    }
+}