[Issue 17878] New: Add __traits(isFuture, ...)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17878

          Issue ID: 17878
           Summary: Add __traits(isFuture, ...)
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: greensunny12 at gmail.com

There is currently no way to test whether a particular symbol is going to be
introduced. It might be worthwhile to investigate whether this could be part of
getFunctionAttributes
(https://dlang.org/spec/traits.html#getFunctionAttributes).

See also: https://issues.dlang.org/show_bug.cgi?id=17791

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