Executable in cwd highlighted when cwd isn't in $PATH

[danielshahaf]

After the following:

$ zsh -f
% . ./zsh-syntax-highlighting.zsh
% () { touch $1 && chmod +x $1 && print -zr -- $1} "$(pwgen -an 16 1 | tee /dev/tty)"
[run that, then type a space to refresh highlighting]

the command word is highlighted in green, even though running it fails with zsh: command not found.

[danielshahaf]

zsh-syntax-highlighting/highlighters/main/main-highlighter.zsh

Lines 1215 to 1221 in caa749d

	if (( in_command_position )); then
	# ### Currently, this value is never returned: either it's overwritten
	# ### below, or the return code is non-zero
	REPLY=arg0
	else
	REPLY=path
	fi

That arg0 is returned, just like the comment says can't happen.

[danielshahaf]

As is this one:

zsh-syntax-highlighting/highlighters/main/main-highlighter.zsh

Lines 1250 to 1252 in caa749d

	elif [[ ! -d $expanded_path ]]; then
	# ### This seems unreachable for the current callers
	return 0

I guess the surrounding chain of if/else's needs to account for the possibility that $expanded_path is an executable non-directory without slashes and $path doesn't include cwd.