From c08674da28a567dd77e64385eaf56d7607757d4d Mon Sep 17 00:00:00 2001
From: Roy Ivy III <rivy.dev@gmail.com>
Date: Tue, 7 Apr 2020 21:55:04 -0500
Subject: [PATCH] fix build failure caused by data-encoding v2.2.0

- hold data-encoding to known working "<= 2.1.2"

.# [why]

data-encoding v2.2.0 causes a build error for '1.31.0-i686-pc-windows-msvc'.

```
cargo +1.31.0-i686-pc-windows-msvc build --target=i686-pc-windows-msvc --all-features
...
error[E0658]: imports can only refer to extern crate names passed with `--extern` on stable channel (see issue #53130)
   --> C:\Users\appveyor\.cargo\registry\src\github.com-1ecc6299db9ec823\data-encoding-2.2.0\src\lib.rs:194:5
    |
187 | / mod prelude {
188 | |     pub use std::borrow::Cow;
189 | | }
    | |_- not an extern crate passed with `--extern`
...
194 |   use prelude::*;
    |       ^^^^^^^
    |
...
```
---
 src/uucore/Cargo.toml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/uucore/Cargo.toml b/src/uucore/Cargo.toml
index 0fcf2021a..2148eb2d4 100644
--- a/src/uucore/Cargo.toml
+++ b/src/uucore/Cargo.toml
@@ -21,14 +21,16 @@ getopts = "<= 0.2.21"
 failure = { version = "<= 0.1.1", optional = true }
 failure_derive = { version = "<= 0.1.1", optional = true }
 time = { version = "<= 0.1.42", optional = true }
-data-encoding = { version = "^2.1", optional = true }
 libc = { version = "<= 0.2.66", optional = true }
 wild = "2.0.1"
 nix = { version = "<= 0.13", optional = true }
 lazy_static = { version = "1.3", optional = true }
 platform-info = { version = "<= 0.0.1", optional = true }
+## problem dependencies
 # * transitive dependency via 'failure'; pin to <= v0.3.30 to avoid increasing MinSRV to v1.33.0
 backtrace = ">= 0.3.3, <= 0.3.30"
+# * data-encoding: require 2.1, but 2.2.0 breaks the build for MinSRV 1.31.0
+data-encoding = { version = "~2.1", optional = true }
 
 [target.'cfg(target_os = "redox")'.dependencies]
 termion = "1.5"