[Issue 498] New: Signal mixins need to import

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=498

           Summary: Signal mixins need to import
           Product: D
           Version: 0.173
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Phobos
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: daekharel at gmail.com


std.signal's Signal template relies on having std.stdio, std.c.stdlib, and
std.outofmemory available where it is instantiated, since it has to be mixed
in, and is therefore evaluated in the scope where it is instantiated, not in
the scope of the std.signals module. This means anyone wishing to use
std.signals must import those modules, which is undocumented.

Either this should be documented, or (better yet) the Signal template itself
should import the required modules, like so:

template Signal(T1...) {
    import std.outofmemory, std.stdio, std.c.stdlib;
    ... rest of template body ...
}


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