Reproduce serde bug

   Compiling cargo_metadata v0.9.1 (/home/matklad/projects/cargo_metadata)
error: proc-macro derive panicked
  --> src/messages.rs:99:35
   |
99 | #[derive(Debug, Clone, Serialize, Deserialize)]
   |                                   ^^^^^^^^^^^
   |
   = help: message: index out of bounds: the len is 5 but the index is 5

error: aborting due to previous error

error: could not compile `cargo_metadata`.

src/messages.rs

@@ -112,6 +112,7 @@ pub enum Message {
     BuildFinished(BuildFinished),
     /// A line of text which isn't a cargo or compiler message.
     /// Line separator is not included
+    #[serde(skip)]
     TextLine(String),
     #[doc(hidden)]
     #[serde(other)]