Something seems borked with your brew, but Iβm afraid I donβt know what. When I do brew info hugo I am getting:
hugo: stable 0.14 (bottled), HEAD
Configurable static site generator
https://gohugo.io/
Not installed
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/hugo.rb
==> Dependencies
Build: go β
You might need to run brew update and brew upgrade before brew install hugo to make sure you have all the newest references. In human, so brew gets the newest download links.