[Issue 20447] [REG 2.089] importing core.thread exposes unistd, hiding object.dup

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20447

--- Comment #3 from Rainer Schuetze <r.sagitario at gmx.de> ---
I've dustmited it to this:

--- test.d
void foo()
{
    import p.b;
    int[] x;
    auto b = x.dup;
}

--- p/b.d
module p.b;
package import p.c;

--- p/c.d
module p.c;
void dup(int);


i.e. a package import leaks. Probably related:
https://issues.dlang.org/show_bug.cgi?id=11065

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