Export function only to module test?

Question

I use the standard way (according to the Rust book) to write unit tests:

fn func() -> i32 {
    0
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn func_test() {
        let res = func();
    }
}

to make it compile, I have to make func public via the pub keyword.

Is it possible to make func private, but use it inside the inner test module?

Answer 1

As of Rust 1.15 your code works without problems!

Previously only public symbols were imported via a wildcard-import (like use super::*;). This behavior changed as specified in RFC 1560. You can see my full previous answer in the edit logs.