fn body(it: *FieldIterator, len: u32) ?[]const Inst.Index it: *FieldIteratorlen: u325548
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5553 fn body(it: *FieldIterator, len: u32) ?[]const Inst.Index {
if (len == 0) return null;
const b = it.bodies_overlong[0..len];
it.bodies_overlong = it.bodies_overlong[len..];
return b;
}