[Issue 18812] New: template enforce should accept same parameter combos as exception

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18812

          Issue ID: 18812
           Summary: template enforce should accept same parameter combos
                    as exception
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: elpenguino+D at gmail.com

Currently, the enforce!SomeException form of enforce can use only msg/file/line
combinations. I believe this is an unnecessary restriction and this form of
enforce should be able to use any constructor for SomeException as long as
enforce's parameters match up - for example:

`
class SomeException : Exception {
    uint somethingMeaningful;
    this(uint a) {
        somethingMeaningful = a;
        super("Something went wrong!");
    }
}

enforce!SomeException(false, 4);
`

Removing this restriction would be a HUGE usability improvement and would make
this much more viable in @nogc code.

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