zsh completion: duplicate commands

Question

Lets say I have an alias for grep. When I use zsh completion, it will offer grep twice (once as command, once as alias):

gr<TAB>
grep
grep

I found I can use ignored-patterns specifically for aliases for commands or for builtins or functions"

zstyle ':completion:*:*:-command-:*:aliases' ignored-patterns 'grep'
zstyle ':completion:*:*:-command-:*:commands' ignored-patterns 'foo'
zstyle ':completion:*:*:-command-:*:builtins' ignored-patterns 'something'
zstyle ':completion:*:*:-command-:*:functions' ignored-patterns 'something'

but there are some completions I need to ignore which are neither of these categories:

which coproc
coproc: shell reserved word

also, if I have variable defined, it completed the variable:

foo=1

fo<TAB>
foo

how can I specify "shell reserved words" and variables to be ignored ?

UPDATE:

after further research, I found the general syntax for zstyle:

':completion:<function>:<completer>:<command>:<argument>:<tag>'

and what I am looking for is the proper tag name for "reserved word", such as coproc

Answer 1

There is a far easier way to get rid of duplicate entries coming from different tags: Put the tags in the same group.

zstyle ':completion:*:*:-command-:*:*' \
    group-name -command-

In any case, the tag for reserved words is… 🥁 reserved-words. You can see that in the code here.