[zsh] anonymous function breaks the alias after it

[FranklinYu]

The code with a problem is:

function named {
	# do something
}
alias foo=bar  # highlights correctly

function {
	# do something anonymously
}
alias foo=bar  # highlights incorrectly
alias bar=baz  # recovered

function {
	# do something anonymously
}

alias foo=bar  # no problem

It looks like:

It should look like:

The keyword alias should be highlighted even right after the anonymous function.

Reference: https://zsh.sourceforge.io/Doc/Release/Functions.html#Anonymous-Functions