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dotdot dotdot dotdot is a hard quant interview question on language knowledge in Rust.
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This hard Rust question tests your ability to read and reason about language features that are syntactically valid but may behave in unexpected ways. It rewards close attention to Rust's type system, operator overloading, and implicit conversions.
To answer correctly, you need to trace through what the compiler sees when it encounters the code, distinguish between what code might appear to do and what it actually does, and understand how Rust resolves ambiguities in parsing and type inference. Interviewers use questions like this to gauge whether you have internalized Rust semantics rather than just pattern-matched your way through syntax.