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Diffstat (limited to 'src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs')
-rw-r--r-- | src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs b/src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs new file mode 100644 index 000000000..61edd2ace --- /dev/null +++ b/src/test/ui/overloaded/overloaded_deref_with_ref_pattern_issue15609.rs @@ -0,0 +1,37 @@ +// run-pass +#![allow(dead_code)] +#![allow(unused_variables)] +// Test that we choose Deref or DerefMut appropriately based on mutability of ref bindings (#15609). + +fn main() { + use std::cell::RefCell; + + struct S { + node: E, + } + + enum E { + Foo(u32), + Bar, + } + + // Check match + let x = RefCell::new(S { node: E::Foo(0) }); + + let mut b = x.borrow_mut(); + match b.node { + E::Foo(ref mut n) => *n += 1, + _ => (), + } + + // Check let + let x = RefCell::new(0); + let mut y = x.borrow_mut(); + let ref mut z = *y; + + fn foo(a: &mut RefCell<Option<String>>) { + if let Some(ref mut s) = *a.borrow_mut() { + s.push('a') + } + } +} |