Checksum error on beta-x86_64-pc-windows-msvc

[johnthagen]

Getting a rustup error on AppVeyor trying to install the latest beta-x86_64-pc-windows-msvc.

https://ci.appveyor.com/project/johnthagen/rust-belt/build/1.0.382/job/u03gx26x0aw3lest

[00:00:00] Build started
[00:00:00] git clone -q https://github.com/johnthagen/rust-belt.git C:\projects\rust-belt
[00:00:03] git fetch -q origin +refs/pull/96/merge:
[00:00:03] git checkout -qf FETCH_HEAD
[00:00:03] Running Install scripts
[00:00:03] $PSVersionTable.PSVersion
[00:00:03] 
[00:00:03] Major  Minor  Build  Revision
[00:00:03] -----  -----  -----  --------
[00:00:03] 5      0      10586  117     
[00:00:03] 
[00:00:03] 
[00:00:03] pwd
[00:00:03] 
[00:00:03] Path                 
[00:00:03] ----                 
[00:00:03] C:\projects\rust-belt
[00:00:03] 
[00:00:03] 
[00:00:03] curl -sSf -o rustup-init.exe https://win.rustup.rs
[00:00:06] rustup-init.exe --default-host %TARGET% --default-toolchain %CHANNEL% -y
[00:00:06] info: syncing channel updates for 'beta-x86_64-pc-windows-msvc'
[00:00:07] info: update not yet available, sorry! try again later
[00:00:07] error: checksum failed, expected: '989d160838c6aceb15d5933be452c5dc5c44bc760e39e0d2951d0ac2a4fdbdd8', calculated: '988ed6ff257ea0bbc87d561da0cad4650e2e6c74ee43fa430adb1caff2f66fdb'
[00:00:07] Command exited with code 1

Relates to #331, #346, and #524.

[johnthagen]

This seems to be fixed now on my build: https://ci.appveyor.com/project/johnthagen/rust-belt/build/1.0.387/job/wahrfddtlc5n65ew

I'll leave this issue open in case a rustup dev wants to look at a core issue related to why this originally happened.

[brson]

Thank you for the report @johnthagen!

Closing in favor of #990.