Formatting changes semantics of imports #3750
Description
I have a project with a module that re-exports other definitions as follows:
mod defs {
#[cfg(feature = "std")]
pub use std::vec;
#[cfg(not(feature = "std"))]
pub use alloc::vec;
}Oftentimes I want to use the vec! macro and Vec type like so:
use defs::{
vec,
vec::Vec,
};However, rustfmt thinks this is worse than
use defs::vec::{self, Vec};However, this has different semantics since vec above refers to the vec! macro while self in the replaced variant refers to the vec submodule of defs. So I can no longer access the vec! macro whenever rustfmt replaced this.
To be honest: I don't know whether this is a rustfmt bug or a Rust compiler bug.