extern_in_paths
The tracking issue for this feature is: #44660
The extern_in_paths
feature allows to refer to names from other crates “inline”, without introducing extern crate
items, using keyword extern
.
For example, extern::my_crat::a::b
will resolve to path a::b
in crate my_crate
.
Absolute paths on 2018 edition (e.g. ::my_crate::a::b
) provide the same effect and resolve to extern crates (built-in or passed with --extern
).
#![feature(extern_in_paths)] // Suppose we have a dependency crate `xcrate` available through `Cargo.toml`, or `--extern` // options, or standard Rust distribution, or some other means. use extern::xcrate::Z; fn f() { use extern::xcrate; use extern::xcrate as ycrate; let s = xcrate::S; assert_eq!(format!("{:?}", s), "S"); let z = ycrate::Z; assert_eq!(format!("{:?}", z), "Z"); } fn main() { let s = extern::xcrate::S; assert_eq!(format!("{:?}", s), "S"); let z = Z; assert_eq!(format!("{:?}", z), "Z"); }