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const U = union {
a: fn () void,
b: *U,
};
pub export fn entry() void {
var u: U = undefined;
_ = u;
}
// error
// backend=stage2
// target=native
//
// :6:12: error: variable of type 'tmp.U' must be const or comptime
// :2:8: note: union requires comptime because of this field
// :2:8: note: use '*const fn() void' for a function pointer type
// :3:8: note: union requires comptime because of this field
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