// A protocol method that omits the explicit receiver (the old implicit form)
// is now a parse error — the receiver `self: *Self`/`self: Self` is required as
// the first parameter. This guards the diagnostic.
#import "modules/std.sx";

Show :: protocol {
    show :: () -> string;        // ERROR: missing `self` receiver
}

main :: () -> i32 {
    return 0;
}