From 4ec27ff42661e30ad0849b9668d62e039454b0b6 Mon Sep 17 00:00:00 2001
From: Jeremy Wall <jwall@gohealth.com>
Date: Tue, 13 Aug 2019 09:48:13 -0500
Subject: [PATCH] DEV: Collapse fields when merging yaml maps

---
 src/convert/yaml.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/convert/yaml.rs b/src/convert/yaml.rs
index 22cc170..54ba689 100644
--- a/src/convert/yaml.rs
+++ b/src/convert/yaml.rs
@@ -1,4 +1,5 @@
 use std;
+use std::collections::BTreeSet;
 use std::error::Error;
 use std::io::Write;
 use std::rc::Rc;
@@ -123,7 +124,17 @@ impl YamlConverter {
             serde_yaml::Value::Mapping(m) => {
                 let mut fs = Vec::with_capacity(m.len());
                 self.merge_mapping_keys(&mut fs, m)?;
-                Val::Tuple(fs)
+				fs.reverse();
+				let mut seen_keys = BTreeSet::new();
+				let mut collapsed = Vec::with_capacity(fs.len());
+				for (k, val) in fs {
+					if !seen_keys.contains(&k) {
+						collapsed.push((k.clone(), val));
+						seen_keys.insert(k);
+					}
+				}
+				collapsed.reverse();
+                Val::Tuple(collapsed)
             }
         })
     }