If I do:

extern crate regex;
fn main() {
    let s: String = regex::Regex::new("...").unwrap();
}

I get (as expected) an error (E0308 mismatched types) saying ... found type regex::Regex.

However, if I instead do:

use regex;
fn main() {
    let s: String = regex::Regex::new("...").unwrap();
}

I get an error saying ... found type regex::re_unicode::Regex.

But regex::re_unicode is private.

Observed with rustc 1.32.0-nightly (2018-11-15) with edition = "2018" and dependency of regex = "1.0".regex = "1.0"

#21934 is tracking work on not exposing private types. Feel free to dupe against that if you like, but I thought I'd raise this separately since although not technically a regression (I was using the same compiler), it feels like the experience of using the newer 2018 style is worse for this particular case.