I think I've solved issues with is_assignable and references to incomplete
types. The updated patch adds tests for this case.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276603 91177308-0d34-0410-b5e6-96231b3b80d8
This is a breaking change. The SFINAE required is instantiated the second
the class is instantiated, and this can cause hard SFINAE errors
when applied to references to incomplete types. Ex.
struct IncompleteType;
extern IncompleteType it;
std::tuple<IncompleteType&> t(it); // SFINAE will blow up.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276598 91177308-0d34-0410-b5e6-96231b3b80d8
