rust update nightly failure after run "brew upgrade" on macos #1607

anonymous:notes sonven$ rustup -v update nightly
verbose: read metadata version: '12'
verbose: installing toolchain 'nightly-x86_64-apple-darwin'
verbose: toolchain directory: '/Users/sonven/.rustup/toolchains/nightly-x86_64-apple-darwin'
info: syncing channel updates for 'nightly-x86_64-apple-darwin'
verbose: creating temp file: /Users/sonven/.rustup/tmp/0w5a0s3bsjw880v6_file
verbose: downloading file from: 'https://static.rust-lang.org/dist/channel-rust-nightly.toml.sha256'
verbose: downloading with curl
verbose: deleted temp file: /Users/sonven/.rustup/tmp/0w5a0s3bsjw880v6_file
verbose: no update hash at: '/Users/sonven/.rustup/update-hashes/nightly-x86_64-apple-darwin'
verbose: creating temp file: /Users/sonven/.rustup/tmp/_jc9gnsaj8d44rgr_file.toml
verbose: downloading file from: 'https://static.rust-lang.org/dist/channel-rust-nightly.toml'
verbose: downloading with curl
299.6 KiB / 299.6 KiB (100 %) 112.0 KiB/s ETA:   0 s                
verbose: checksum passed
verbose: deleted temp file: /Users/sonven/.rustup/tmp/_jc9gnsaj8d44rgr_file.toml
info: latest update on 2019-01-10, rust version 1.33.0-nightly (6ecad3383 2019-01-09)
info: downloading component 'rustc'
verbose: removing toolchain directory: '/Users/sonven/.rustup/toolchains/nightly-x86_64-apple-darwin'
error: failed to parse url: nightly/2019-01-10/rustc-nightly-x86_64-apple-darwin.tar.xz
info: caused by: relative URL without a base