Ambiguous glob import in polars_plan results in privacy error

[cramertj]

This repository has a basic cargo build that will demonstrate the issue and reproduce on rustc 1.90.0-nightly (9748d87dc 2025-07-21).

An ambiguous glob import results in a misleading error message rather than preferring the more public item.

Error message:

error[E0603]: function `date_range` is private
  --> src/main.rs:2:27
   |
2  |     use polars_plan::dsl::date_range;
   |                           ^^^^^^^^^^ private function
   |
note: the function `date_range` is defined here
  --> /usr/local/google/home/cramertj/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/polars-plan-0.48.1/src/dsl/mod.rs:87:5
   |
87 | use crate::prelude::*;
   |     ^^^^^^^^^^^^^^
help: import `date_range` directly
   |
2  -     use polars_plan::dsl::date_range;
2  +     use polars_time::date_range::date_range;
   |

error[E0603]: function `time_range` is private
  --> src/main.rs:3:27
   |
3  |     use polars_plan::dsl::time_range;
   |                           ^^^^^^^^^^ private function
   |
note: the function `time_range` is defined here
  --> /usr/local/google/home/cramertj/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/polars-plan-0.48.1/src/dsl/mod.rs:87:5
   |
87 | use crate::prelude::*;
   |     ^^^^^^^^^^^^^^
help: import `time_range` directly
   |
3  -     use polars_plan::dsl::time_range;
3  +     use polars_time::date_range::time_range;
   |

For more information about this error, try `rustc --explain E0603`.

date_range
and
time_range
are both defined as pub and exported under polars_plan::dsl via the following chain of pub use statements:

1. pub mod dsl in lib.rs
2. pub use functions::*; in dsl/mod.rs
3. pub use range::date_range and pub use range::time_range in dsl/functions/mod.rs

However, rustc provides an error message pointing at polars_time::date_range::{date_range, time_range}, despite the fact that
the current crate has no direct dependency on polars_time.

Furthermore, rustc thinks that the date_range and time_range types were defined in src/dsl/mod.rs:87:

use crate::prelude::*;

The prelude does include a pub(crate) reexport of the types from polars_time.
However, it also includes a (circular) pub reexport of the dsl::* types

Based on the (incomplete) Rust reference section on use,
I would expect an ambiguity error rather than a privacy error.

That said, it would also make sense to allow this example to work and access the public item, as occurs here:

mod priv_fn {
    fn some_fn() {
        println!("private")
    }
}

mod pub_fn {
    pub fn some_fn() {
        println!("public")
    }
}

mod reexport_both {
    pub use crate::priv_fn::*;
    pub use crate::pub_fn::*;
}

fn main() {
    reexport_both::some_fn();  // prints "public"
}