Static AMBIGUOUS_PANIC_IMPORTS 

pub static AMBIGUOUS_PANIC_IMPORTS: &'static Lint

The ambiguous_panic_imports lint detects ambiguous core and std panic imports, but previously didn’t do that due to #[macro_use] prelude macro import.

Example

#![deny(ambiguous_panic_imports)]
#![no_std]

extern crate std;
use std::prelude::v1::*;

fn xx() {
    panic!(); // resolves to core::panic
}

{{produces}}

Explanation

Future versions of Rust will no longer accept the ambiguous resolution.

This is a future-incompatible lint to transition this to a hard error in the future.