• d-bugmail puremagic.com (42/42) Aug 11 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8538

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8538

           Summary: array variadic apparently doesn't get copied in
                    closure
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: destructionator gmail.com


--- Comment #0 from Adam D. Ruppe <destructionator gmail.com> 2012-08-11
12:23:47 PDT ---
===

void delegate() test(Object[] objs...) {
        return {
                foreach(obj; objs)
                        assert(obj);
        };
}

void delegate() foo() {
        return test(new Object, new Object);
}

void main() {
        auto ok = test(new Object, new Object);
        ok(); // no problem

        auto it = foo(); // but if we build the array elsewhere
        it(); // this triggers a failure
}

===


My guess is the arguments are on the enclosing stack, so the ok() call is fine,
because the test call is still there.

But, the foo call leaves that [new Object, new Object] on the stack, which is
now potentially invalid.


Other local variables are copied in this situation for a closure, but it looks
like the variadic arg case was overlooked.



Marked as minor because it is very easy to work around and this combination of
features is super rare anyway.

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