Please, help me to understand why I can't declare F: FnMut in the following example: pub struct Analyzer<F> { postprocess: F } impl<F: FnMut(i32) -> i32> Analyzer<F> { fn process(&self, n: i32) -> i32 { n + 1 } pub fn pipeline(&self, n: i32) -> i32 { let n = self.process(n); …

Why can't `self.lambda` be `FnMut` when `self` is borrowed immutably?

SkiFire13 July 6, 2024, 11:30am 5

Note that multiple threads are not needed to show UB, although in a single-thread context it is a bit more involved. See for example Rust Playground

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