rust/src/test/compile-fail/fn-variance-1.rs

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fn takes_mut(&&x: @mut int) { }
fn takes_const(&&x: @const int) { }
fn takes_imm(&&x: @int) { }
fn apply<T>(t: T, f: fn(T)) {
f(t)
}
fn main() {
apply(@3, takes_mut); //! ERROR (values differ in mutability)
apply(@3, takes_const);
apply(@3, takes_imm);
apply(@mut 3, takes_mut);
apply(@mut 3, takes_const);
apply(@mut 3, takes_imm); //! ERROR (values differ in mutability)
}