From ba505647f21a1355e1f36e2263fe6fd639adc38a Mon Sep 17 00:00:00 2001
From: Alan Du <alanhdu@gmail.com>
Date: Thu, 1 Jun 2017 11:38:56 +0100
Subject: [PATCH] Close #180

---
 src/ser.rs | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/ser.rs b/src/ser.rs
index 22eda81b..8f6b366b 100644
--- a/src/ser.rs
+++ b/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");