[llvm-bugs] [Bug 25250] New: Template argument deduction via alias template fails spuriously

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25250

            Bug ID: 25250
           Summary: Template argument deduction via alias template fails
                    spuriously
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: r.hl at gmx.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

template <typename... T>
using funptr = void(*)(T...);

template <typename... T>
void f(funptr<T...>) {}

template void f(void(*)());

-----------------------------------------------------

The declared function template is ignored: "[…] failed template argument
deduction void f(funptr<T...>) {}".
If we use deduction from a function call instead, the error message suggests
that, although T is correctly deduced(!), there is a substitution failure.

(The above is indeed well-formed though; see CWG 1430 and 1700)

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