2 files changed, 13 insertions, 1 deletions
diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index c76cbca160d..3af914475c8 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -5528,7 +5528,7 @@ Sema::CreateOverloadedUnaryOp(SourceLocation OpLoc, unsigned OpcIn,
 
   // Add candidates from ADL.
   AddArgumentDependentLookupCandidates(OpName, /*Operator*/ true,
-                                       Args, 1,
+                                       Args, NumArgs,
                                        /*ExplicitTemplateArgs*/ 0,
                                        CandidateSet);
 
diff --git a/clang/test/SemaTemplate/instantiate-expr-1.cpp b/clang/test/SemaTemplate/instantiate-expr-1.cpp
index 34fc6af746d..d1b05f66a58 100644
--- a/clang/test/SemaTemplate/instantiate-expr-1.cpp
+++ b/clang/test/SemaTemplate/instantiate-expr-1.cpp
@@ -87,6 +87,18 @@ void add(const T &x) {
   (void)(x + x);
 }
 
+namespace PR6237 {
+  template <typename T>
+  void f(T t) {
+    t++;
+  }
+
+  struct B { };
+  B operator++(B &, int);
+
+  template void f(B);
+}
+
 struct Addable {
   Addable operator+(const Addable&) const;
 };