// Writing to a `#get`-only property (no matching `#set`) is rejected with a
// clear "read-only" diagnostic — not the generic "field not found" the bare
// struct-store path would emit. (The write counterpart, a `#set`-only
// property, accepts plain assignment but rejects compound `+=` because there is
// no `#get` to read the current value.)
#import "modules/std.sx";

Reading :: struct {
    raw: i64 = 0;
    doubled :: (self: *Reading) -> i64 #get => self.raw * 2;
}

main :: () -> i64 {
    r : Reading = .{ raw = 5 };
    r.doubled = 10;     // ERROR: property 'doubled' is read-only (no '#set')
    return 0;
}