38 lines
719 B
Rust
38 lines
719 B
Rust
//@ run-pass
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#![allow(dead_code)]
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#![allow(unused_variables)]
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// Test that we choose Deref or DerefMut appropriately based on mutability of ref bindings (#15609).
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fn main() {
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use std::cell::RefCell;
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struct S {
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node: E,
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}
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enum E {
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Foo(u32),
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Bar,
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}
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// Check match
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let x = RefCell::new(S { node: E::Foo(0) });
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let mut b = x.borrow_mut();
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match b.node {
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E::Foo(ref mut n) => *n += 1,
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_ => (),
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}
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// Check let
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let x = RefCell::new(0);
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let mut y = x.borrow_mut();
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let ref mut z = *y;
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fn foo(a: &mut RefCell<Option<String>>) {
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if let Some(ref mut s) = *a.borrow_mut() {
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s.push('a')
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}
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}
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}
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