[Issue 18167] New: std.array.appender should be usable in @safe

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18167

          Issue ID: 18167
           Summary: std.array.appender should be usable in @safe
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

void test @safe
{
    import std.array;

    struct S
    {
        void opAssign(S)
        {
        }
    }

    auto a1 = Appender!(const(S)[])();
    auto s1 = const(S)();
    a1.put(s1);
}

onlineapp.d(14): Error: @safe function 'onlineapp.test' cannot call @system
function 'std.array.Appender!(const(S)[]).Appender.put!(const(S)).put'

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