From f34990e9b504ab5062d0dbd953d45bc382de0bc6 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Fri, 29 Nov 2019 23:15:45 -0800
Subject: [PATCH] Remove unneeded prelude imports in libcore tests

These three lines are from c82da7a54b9efb1a0ccbe11de66c71f547bf7db9 in
2015.

They cause problems when applying rustfmt to the codebase, because
reordering wildcard imports can trigger new unused import warnings.

As a minimized example, the following program compiles successfully:

    #![deny(unused_imports)]

    use std::fmt::Debug;
    use std::marker::Send;

    pub mod repro {
        use std::prelude::v1::*;
        use super::*;

        pub type D = dyn Debug;
        pub type S = dyn Send;
    }

    pub type S = dyn Send;

but putting it through rustfmt produces a program that fails to compile:

    #![deny(unused_imports)]

    use std::fmt::Debug;
    use std::marker::Send;

    pub mod repro {
        use super::*;
        use std::prelude::v1::*;

        pub type D = dyn Debug;
        pub type S = dyn Send;
    }

    pub type S = dyn Send;

The error is:

    error: unused import: `std::prelude::v1::*`
     --> src/main.rs:8:9
      |
    8 |     use std::prelude::v1::*;
      |         ^^^^^^^^^^^^^^^^^^^
---
 src/libcore/tests/num/bignum.rs                  | 1 -
 src/libcore/tests/num/flt2dec/mod.rs             | 1 -
 src/libcore/tests/num/flt2dec/strategy/dragon.rs | 1 -
 3 files changed, 3 deletions(-)

diff --git a/src/libcore/tests/num/bignum.rs b/src/libcore/tests/num/bignum.rs
index b9e15ec5c0763..50a3ec046ad13 100644
--- a/src/libcore/tests/num/bignum.rs
+++ b/src/libcore/tests/num/bignum.rs
@@ -1,4 +1,3 @@
-use std::prelude::v1::*;
 use core::num::bignum::tests::Big8x3 as Big;
 
 #[test]
diff --git a/src/libcore/tests/num/flt2dec/mod.rs b/src/libcore/tests/num/flt2dec/mod.rs
index a35897e9bc1ac..f85369ce40b8d 100644
--- a/src/libcore/tests/num/flt2dec/mod.rs
+++ b/src/libcore/tests/num/flt2dec/mod.rs
@@ -1,4 +1,3 @@
-use std::prelude::v1::*;
 use std::{str, i16, f32, f64, fmt};
 
 use core::num::flt2dec::{decode, DecodableFloat, FullDecoded, Decoded};
diff --git a/src/libcore/tests/num/flt2dec/strategy/dragon.rs b/src/libcore/tests/num/flt2dec/strategy/dragon.rs
index dc4d78bfae109..0c545b4d88714 100644
--- a/src/libcore/tests/num/flt2dec/strategy/dragon.rs
+++ b/src/libcore/tests/num/flt2dec/strategy/dragon.rs
@@ -1,4 +1,3 @@
-use std::prelude::v1::*;
 use super::super::*;
 use core::num::bignum::Big32x40 as Big;
 use core::num::flt2dec::strategy::dragon::*;