Close toml-rs#180

src/ser.rs

@@ -308,8 +308,28 @@ impl<'a> Serializer<'a> {
  State::Array { .. } => true,
  _ => false,
  };
+
+ // Unlike [..]s, we can't omit [[..]] ancestors, so be sure to emit table
+ // headers for them.
+ let mut p = state;
+ if let State::Array { first, parent, .. } = *state {
+ if first.get() {
+ p = parent;
+ }
+ }
+ while let State::Table { first, parent, .. } = *p {
+ p = parent;
+ if !first.get() {
+ break;
+ }
+ if let State::Array { parent: &State::Table {..}, ..} = *parent {
+ self.emit_table_header(parent)?;
+ break;
+ }
+ }
+
  match *state {
- State::Table { first , .. } |
+ State::Table { first, .. } |
  State::Array { parent: &State::Table { first, .. }, .. } => {
  if !first.get() {
  self.dst.push_str("\n");