From 72b3855bf58702b3731d74f8eb24f8c5dfb150d8 Mon Sep 17 00:00:00 2001
From: Eric Liu <ioeric@google.com>
Date: Tue, 9 Jan 2018 20:26:49 +0000
Subject: [PATCH] Try to fix build failure caused by r322097

Avoid mapping during output when Detail is nullptr; otherwise, an empty
"Detail" field will be populated in YAML output.

llvm-svn: 322116
---
 clang-tools-extra/clangd/index/SymbolYAML.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang-tools-extra/clangd/index/SymbolYAML.cpp b/clang-tools-extra/clangd/index/SymbolYAML.cpp
index 295b2207ca01..8a58a6dfb8a6 100644
--- a/clang-tools-extra/clangd/index/SymbolYAML.cpp
+++ b/clang-tools-extra/clangd/index/SymbolYAML.cpp
@@ -92,7 +92,8 @@ template <> struct MappingTraits<Symbol> {
 
     IO.mapOptional("CompletionSnippetInsertText",
                    Sym.CompletionSnippetInsertText);
-    IO.mapOptional("Detail", Sym.Detail);
+    if (!IO.outputting() || Sym.Detail)
+      IO.mapOptional("Detail", Sym.Detail);
   }
 };