Brew install libimobiledevice failed: EOS.undent is disabled

according to libimobiledevice failure, the error is "Error: Calling < <-EOS.undent is failed!"

brew install libimobiledevice
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (caskroom/cask).
Error: Calling <<-EOS.undent is disabled!
Use <<~EOS instead.
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/cython.rb:17:in `<class:Cython>"
Please report this to the homebrew/core tap!
Or, even better, submit a PR to fix it!

how to solve this problem?

Mar.25,2021

the solution is simple

brew update
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