brew update failure while executing git checkout

Question

After an interrupted brew update because of a network issue, Homebrew appears to be broken:

$ brew update
error: pathspec \'master\' did not match a         


        

Answer 1

What solved Homebrew git errors for me was simply to cd ~ and run brew update in my home directory. The command failed when I was in a folder shared on GitHub. Also, clang magically appeared again from brew config after cd ~.