File: missing-derivable-attr.rs

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trait MyEq {
    fn eq(&self, other: &Self) -> bool;
}

struct A {
    x: isize
}

impl MyEq for isize {
    fn eq(&self, other: &isize) -> bool { *self == *other }
}

impl MyEq for A {}  //~ ERROR not all trait items implemented, missing: `eq`

fn main() {
}