[Issue 24550] New: formattedWrite should support string interpolation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24550

          Issue ID: 24550
           Summary: formattedWrite should support string interpolation
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: default_357-line at yahoo.de

auto sink = appender!(char[]);

const world = "World";

// This works
sink.formattedWrite("Hello %s", world);

// This does not.
sink.formattedWrite(i"Hello $(world)");

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