@@echo directory created when running `make install` after `make`

[aidanhs]

Also prepare:.

[aidanhs]

[pid 29462] execve("/bin/mkdir", ["mkdir", "-p", "tmp/dist/rustc-1.2.0-dev-x86_64-"..., "@@echo", "prepare:", "tmp/dist/rustc-1.2.0-dev-x86_64-"...], [/* 81 vars */]) = 0

[aidanhs]

Like any good bug, turning on debugging changes behaviour (VERBOSE=1). It creates a directory called '@'.

From make output:

umask 022 && mkdir -p tmp/dist/rustc-1.2.0-dev-x86_64-unknown-linux-gnu-image/lib/rustlib/x86_64-unknown-linux-gnu/lib  @

[aidanhs]

Found the problem, making PR.