[PATCH] Special case 0 and 1 matcher in makeAllOfComposite().

[Samuel Benzaquen]

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Comment at: include/clang/ASTMatchers/ASTMatchersInternal.h:450
@@ -436,2 +449,3 @@
   template <typename U> friend class Matcher;
+  friend class DynTypedMatcher;
 
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klimek wrote:
> What is this needed for? I'd prefer if we could get rid of it, but if not, it should have a comment explaining it (so we can take it out if we don't need it any more).
Matcher(DynTypedMatcher) is private because it is essentially "unsafe". You can easily create a matcher that matches nothing.
It is only called by explicit conversions like Matcher<T>::dynCastTo<U> and DynTypedMatcher::unconditionalConvertTo<T>. The friendship is for those functions.

http://reviews.llvm.org/D5675