i've tried it again and i can compile both versions 1) and 2) without error at 9front distro of plan9.
do you use original 4th release of plan9 or 9front distro?

download link of 9front iso: http://9front.org/iso/9front-8593.acc504c319a4b4188479cfa602e40cb6851c0528.amd64.iso.gz

1)

#include <u.h>
#include <libc.h>

uintptr frst[] = {nil, nil, nil, nil, nil};
uintptr scnd[] = {nil, nil, frst, &frst[1]};

void main(void) {
exits(nil);
}

2)
#include <u.h>
#include <libc.h>

void* frst[] = {nil, nil, nil, nil, nil};
void* scnd[] = {nil, nil, frst, &frst[1]};

void main(void) {
exits(nil);
}
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