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+++
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title = "Tricky questions for any rust interview"
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draft = true
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date = "2022-08-18"
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[taxonomies]
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tags = ["rust"]
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+++
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Which type has variable `result`?
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```rust
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fn count_uppercase(s: &str) -> usize {
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let result = {
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let upper = s.chars().filter(|c| c.is_uppercase()).collect::<String>();
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return upper.len();
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};
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}
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```
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<details><summary>Answer</summary>
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`result` has '!' type or 'never type'. . [Read more](https://doc.rust-lang.org/book/ch19-04-advanced-types.html#the-never-type-that-never-returns)
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</details>
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