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trait Mumbo {
fn jumbo(&self, x: &usize) -> usize;
}
impl Mumbo for usize {
// Cannot have a larger effect than the trait:
unsafe fn jumbo(&self, x: &usize) { *self + *x; }
//~^ ERROR method `jumbo` has an incompatible type for trait
//~| expected fn pointer `fn
//~| found fn pointer `unsafe fn
}
fn main() {}
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