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fn test(_x: &mut String) {}
fn test2(_x: &mut i32) {}
fn main() {
let x: usize = String::new();
//~^ ERROR E0308
let x: &str = String::new();
//~^ ERROR E0308
let y = String::new();
test(&y);
//~^ ERROR E0308
test2(&y);
//~^ ERROR E0308
let f;
f = Box::new(f);
//~^ ERROR E0308
let s = &mut String::new();
s = format!("foo");
//~^ ERROR E0308
}
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