[llvm-bugs] [Bug 42362] New: Trunk regression: nested name specifier for a declaration cannot depend on a template parameter

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42362

            Bug ID: 42362
           Summary: Trunk regression: nested name specifier for a
                    declaration cannot depend on a template parameter
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: andyg1001 at hotmail.co.uk
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following code fails to compile in trunk (r364144) and is a regression
compared to released clang 8.0 and earlier:

  template <auto...> struct X {
    struct Y;
  };

  template <auto... S> struct X<S...>::Y {
  };

The error is:

<source>:5:31: error: nested name specifier for a declaration cannot depend on
a template parameter

  template <auto... S> struct X<S...>::Y {
                              ^~~~~~~~~

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