[llvm-bugs] [Bug 40030] New: Designated initialisers - diagnose invalid designator order in C++20

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40030

            Bug ID: 40030
           Summary: Designated initialisers - diagnose invalid designator
                    order in C++20
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++2a
          Assignee: unassignedclangbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

struct S
{
    int number;
    const char *s;
};

S f()
{
    return S{.number = 0, .s = "hi}; // correct order
    return S{.s = "hi",  .number = 0}; // invalid (out of) order
}

This should not be allowed in C++20 (according to a C++2a standard) and GCC
does not compile it - Clang trunk allows it.

GCC:
error: designator order for field 'S::number' does not match declaration order
in 'S'
   12 |     return S{.s = "hi",  .number = 0};

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