69 lines
1.7 KiB
Rust
69 lines
1.7 KiB
Rust
// run-pass
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#![allow(unused_braces)]
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#![allow(dead_code)]
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// pretty-expanded FIXME #23616
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use std::rc::Rc;
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// Examples from the "deref coercions" RFC, at rust-lang/rfcs#241.
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fn use_ref<T>(_: &T) {}
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fn use_mut<T>(_: &mut T) {}
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fn use_rc<T>(t: Rc<T>) {
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use_ref(&*t); // what you have to write today
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use_ref(&t); // what you'd be able to write
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use_ref(&&&&&&t);
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use_ref(&mut &&&&&t);
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use_ref(&&&mut &&&t);
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}
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fn use_mut_box<T>(mut t: &mut Box<T>) {
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use_mut(&mut *t); // what you have to write today
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use_mut(t); // what you'd be able to write
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use_mut(&mut &mut &mut t);
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use_ref(&*t); // what you have to write today
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use_ref(t); // what you'd be able to write
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use_ref(&&&&&&t);
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use_ref(&mut &&&&&t);
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use_ref(&&&mut &&&t);
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}
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fn use_nested<T>(t: &Box<T>) {
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use_ref(&**t); // what you have to write today
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use_ref(t); // what you'd be able to write (note: recursive deref)
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use_ref(&&&&&&t);
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use_ref(&mut &&&&&t);
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use_ref(&&&mut &&&t);
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}
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fn use_slice(_: &[u8]) {}
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fn use_slice_mut(_: &mut [u8]) {}
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fn use_vec(mut v: Vec<u8>) {
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use_slice_mut(&mut v[..]); // what you have to write today
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use_slice_mut(&mut v); // what you'd be able to write
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use_slice_mut(&mut &mut &mut v);
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use_slice(&v[..]); // what you have to write today
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use_slice(&v); // what you'd be able to write
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use_slice(&&&&&&v);
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use_slice(&mut &&&&&v);
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use_slice(&&&mut &&&v);
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}
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fn use_vec_ref(v: &Vec<u8>) {
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use_slice(&v[..]); // what you have to write today
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use_slice(v); // what you'd be able to write
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use_slice(&&&&&&v);
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use_slice(&mut &&&&&v);
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use_slice(&&&mut &&&v);
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}
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fn use_op_rhs(s: &mut String) {
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*s += {&String::from(" ")};
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}
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pub fn main() {}
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