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• 23:56, 15 November 2025 PC talk contribs created page Rust’s Borrow Checker vs. Early Returns: Why Your Fallback Fails (and the One-Line Fix) (Created page with "If you’ve ever tried to “try this, else fall back” with a mutable reference in Rust, you may have met this villain: error[E0499]: cannot borrow `self.val` as mutable more than once at a time It often shows up with code shaped like this: struct Foo { val: i32 } impl Foo { pub fn maybe_get(&mut self) -> Option<&mut i32> { Some(&mut self.val) } pub fn definitely_get(&mut self) -> &mut i32 { if let Some(val) = self.maybe_get() {...")