[Issue 20021] New: `static if` doesn't evaluate `opCast(T : bool)`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20021

          Issue ID: 20021
           Summary: `static if` doesn't evaluate `opCast(T : bool)`
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ag0aep6g at gmail.com

Should compile:

----
struct S
{
    bool opCast(T : bool)() { return true; }
}

void main()
{
    static if (S.init) {} /* Error: expression (S).init of type S does not have
a boolean value */
    static if (!!S.init) {} /* no error */
    if (S.init) {} /* no error */
}
----

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