[arrow] branch master updated: ARROW-4105: [Rust] Add rust-toolchain to enforce user to use nightly toolchain for building

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The following commit(s) were added to refs/heads/master by this push:
     new 7ebd7b3  ARROW-4105: [Rust] Add rust-toolchain to enforce user to use nightly toolchain for building
7ebd7b3 is described below

commit 7ebd7b3aaa5646af8bf9707a590daf29d384cf1d
Author: Kousuke Saruta <sa...@oss.nttdata.com>
AuthorDate: Sat Dec 22 21:09:48 2018 +0100

    ARROW-4105: [Rust] Add rust-toolchain to enforce user to use nightly toolchain for building
    
    The Rust binding needs to be built by nightly toolchain so if we supply rust-toolchain file, user can build without changing the toolchain explicitly.
    
    Author: Kousuke Saruta <sa...@oss.nttdata.com>
    
    Closes #3247 from sarutak/add-rust-toolchain and squashes the following commits:
    
    6ab619b8 <Kousuke Saruta> Add rust-toolchain to rat_exclude_files.txt
    c3fb2aba <Kousuke Saruta> Add rust-toolchain to enforce to use nightly toolchain for building
---
 dev/release/rat_exclude_files.txt | 1 +
 rust/rust-toolchain               | 1 +
 2 files changed, 2 insertions(+)

diff --git a/dev/release/rat_exclude_files.txt b/dev/release/rat_exclude_files.txt
index 66d62c6..bcb474b 100644
--- a/dev/release/rat_exclude_files.txt
+++ b/dev/release/rat_exclude_files.txt
@@ -179,3 +179,4 @@ r/README.Rmd
 r/man/*.Rd
 .gitattributes
 rust/test/data/*.csv
+rust/rust-toolchain
diff --git a/rust/rust-toolchain b/rust/rust-toolchain
new file mode 100644
index 0000000..07ade69
--- /dev/null
+++ b/rust/rust-toolchain
@@ -0,0 +1 @@
+nightly
\ No newline at end of file