Anastasia marked an inline comment as done.
Anastasia added inline comments.


================
Comment at: lib/Sema/TreeTransform.h:5363
+    if (ResultType.getAddressSpace() != LangAS::Default &&
+        (ResultType.getAddressSpace() != LangAS::opencl_private)) {
       SemaRef.Diag(TL.getReturnLoc().getBeginLoc(),
----------------
I am trying to be a bit more helpful here although I am not sure if we should 
instead require explicit template parameter and fail the template deduction 
instead.

Basically, do we want the following code to always require specifying template 
argument explicitly:


```
template <class T>
T xxx(T *in) {
  T *i = in;
  return *i;
}

__kernel void test() {
  int foo[10];
  xxx<int>(&foo[0]); // if we deduce type from foo, it ends up being qualified 
by __private that we currently diagnose. However private is default (implicit) 
address space for return type so technically there is no danger in just 
allowing xxx(&foo[0])
}
```


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62584/new/

https://reviews.llvm.org/D62584



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