rust/src/test/compile-fail/pure-subtyping.rs

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// Test rules governing higher-order pure fns.
fn assign_to_pure(x: pure fn(), y: fn(), z: unsafe fn()) {
let a: pure fn() = x;
let b: pure fn() = y; //! ERROR expected pure fn but found impure fn
let c: pure fn() = z; //! ERROR expected pure fn but found unsafe fn
}
fn assign_to_impure(x: pure fn(), y: fn(), z: unsafe fn()) {
let h: fn() = x;
let i: fn() = y;
let j: fn() = z; //! ERROR expected impure fn but found unsafe fn
}
fn assign_to_unsafe(x: pure fn(), y: fn(), z: unsafe fn()) {
let m: unsafe fn() = x;
let n: unsafe fn() = y;
let o: unsafe fn() = z;
}
fn main() {
}