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diff --git a/folly/FBString.h b/folly/FBString.h
index 4882aac..6c83046 100644
--- a/folly/FBString.h
+++ b/folly/FBString.h
@@ -1890,12 +1890,14 @@ inline basic_fbstring<E, T, A, S>& basic_fbstring<E, T, A, S>::operator=(
template <typename E, class T, class A, class S>
template <typename TP>
-inline typename std::enable_if<
- std::is_same<
- typename std::decay<TP>::type,
- typename basic_fbstring<E, T, A, S>::value_type>::value,
- basic_fbstring<E, T, A, S>&>::type
-basic_fbstring<E, T, A, S>::operator=(TP c) {
+inline auto
+basic_fbstring<E, T, A, S>::operator=(TP c)
+ -> typename std::enable_if<
+ std::is_same<
+ typename std::decay<TP>::type,
+ typename basic_fbstring<E, T, A, S>::value_type>::value,
+ basic_fbstring<E, T, A, S>&>::type
+{
Invariant checker(*this);
if (empty()) {
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