Assertion error when user has a ~/.profile in zsh

[nickhs]

Hey all! I get an assertion error when attempting to run rustup in zsh and I have an existing ~/.profile file. I believe the assertion is incorrect after #1013.

~ ➤ ps
  PID TTY           TIME CMD
11724 ttys000    0:00.03 /Applications/iTerm.app/Contents/MacOS/iTerm2 --serve
11726 ttys000    0:00.24 -zsh
~ ➤ echo $ZSH_VERSION
5.2
~ ➤ curl https://sh.rustup.rs -sSf | sh

info: downloading installer
thread 'main' panicked at 'assertion failed: `(left == right)` (left: `2`, right: `1`)', src/rustup-cli/self_update.rs:495
note: Run with `RUST_BACKTRACE=1` for a backtrace.
rustup: command failed: /var/folders/28/7ycfrlks3nz3thkycn28ny1r0000gn/T/tmp.V5jUMqP2/rustup-init

@brson stated that the PATH changes should be happening in multiple places, which I believe runs counter to what this assertion is checking. https://github.com/rust-lang-nursery/rustup.rs/blob/master/src/rustup-cli/self_update.rs#L495

[nickhs]

Woops this is a duplicate of #1034 - closing.