zsh: extended_glob [x] must be followed by = #1322

#!/bin/zsh --no-rcs
setopt extended_glob null_glob
BASE_DIR="/Applications/PaperCut Print Deploy Client"
YEAR="2025"
matches=( "${BASE_DIR}/v${YEAR}-"[0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9] )
print "Matched folders: ${#matches}"

When running shfmt on this script I get the following error:

`[x]` must be followed by `=`

An example of a folder that would be returned in the matches array: /.../v2025-10-06-1019

Btw, I'm very grateful for the zsh syntax being added to shfmt. It was a very welcome surprise when checking up on the project again last week after finding out about shfmt last year.