Failed to install win32 toolchain on Linux host

[0x7CFE]

tl;dr; Looks like the problem is related to improper handling of path delimiters:

$ rustup target add i686-pc-windows-msvc
info: downloading component 'rust-std' for 'i686-pc-windows-msvc'
info: installing component 'rust-std' for 'i686-pc-windows-msvc'
info: rolling back changes
error: could not copy file from '/home/korvin/.rustup/tmp/62v1xsw0ae7ppgnh_dir/rust-std-i686-pc-windows-msvc/lib\rustlib\i686-pc-windows-msvc\lib\arena-04cd199c7c4cce31.dll' to '/home/korvin/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib\rustlib\i686-pc-windows-msvc\lib\arena-04cd199c7c4cce31.dll'
info: caused by: the source path is not an existing regular file

Notice that the first part of the path uses / and after toolchain triple it gets switched to \ which obviously will not be treated as a valid path on Linux.

I'm running the recent rustup version: rustup 1.3.0 (124170c 2017-05-09)

[0x7CFE]

Sorry, the wrong repo. Moreover it's a duplicate of rust-lang/rustup#1127