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fn a(x: &&i32) -> i32 { x //~^ ERROR mismatched types } fn a2(x: &&&&&i32) -> i32 { x //~^ ERROR mismatched types } fn b(x: &i32) -> i32 { &x //~^ ERROR mismatched types } fn c(x: Box<i32>) -> i32 { &x //~^ ERROR mismatched types } fn d(x: std::sync::Mutex<&i32>) -> i32 { x.lock().unwrap() //~^ ERROR mismatched types } fn main() {}