mirror of https://github.com/rust-lang/rust
28 lines
483 B
Rust
28 lines
483 B
Rust
//@ run-pass
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// Test that we can infer the "kind" of an unboxed closure based on
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// the expected type.
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// Test by-ref capture of environment in unboxed closure types
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fn call_fn<F: Fn()>(f: F) {
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f()
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}
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fn call_fn_mut<F: FnMut()>(mut f: F) {
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f()
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}
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fn call_fn_once<F: FnOnce()>(f: F) {
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f()
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}
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fn main() {
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let mut x = 0_usize;
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let y = 2_usize;
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call_fn(|| assert_eq!(x, 0));
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call_fn_mut(|| x += y);
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call_fn_once(|| x += y);
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assert_eq!(x, y * 2);
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}
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