[Issue 18778] New: std.format: Positional arguments do not work as expected with nesting

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18778

          Issue ID: 18778
           Summary: std.format: Positional arguments do not work as
                    expected with nesting
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: briancschott at gmail.com

---
void main()
{
    import std.stdio;
    writefln("%-(%1$s - %1$s%|, %)", ["A", "B", "C"]);
}
---

Actual output: "A - %1$s, B - %1$s, C - %1$s"
Expected output: "A - A, B - B, C - C"

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