[LLVMbugs] [Bug 24176] New: Unexpected instantiation when using type-alias and sizeof...

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24176

            Bug ID: 24176
           Summary: Unexpected instantiation when using type-alias and
                    sizeof...
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tomasz.miasko at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Clang incorrectly decides to instantiate array<1> in a following code:

template<int S>
struct array {
  static_assert(S != 1);
};

template<typename... Ts>
using array_u = array<sizeof...(Ts)>;

template <typename ...Ts>
void f()
{
  array_u<Ts...> a1;
}


This results in following error message:
a.C:3:3: error: static_assert failed
  static_assert(S != 1);
  ^             ~~~~~~
a.C:12:18: note: in instantiation of template class 'array<1>' requested here
  array_u<Ts...> a1;
                 ^
1 error generated.

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