Failure to install opencv with homebrew

gistfile1.txt

I've type "brew tap homebrew/science" and "brew install opencv". The same error occurs when I tried "brew doctor".

And the following error is 

Error: /usr/local/Library/Taps/homebrew/homebrew-science/opencv.rb:1: syntax error, unexpected tCONSTANT, expecting end-of-input
:lass Opencv < Formula
            ^
Please report this bug:
    https://git.io/brew-troubleshooting
/usr/local/Library/Homebrew/formulary.rb:21:in `module_eval'
/usr/local/Library/Homebrew/formulary.rb:21:in `load_formula'
/usr/local/Library/Homebrew/formulary.rb:38:in `load_formula_from_path'
/usr/local/Library/Homebrew/formulary.rb:87:in `load_file'
/usr/local/Library/Homebrew/formulary.rb:78:in `klass'
/usr/local/Library/Homebrew/formulary.rb:74:in `get_formula'
/usr/local/Library/Homebrew/formulary.rb:171:in `get_formula'
/usr/local/Library/Homebrew/formulary.rb:211:in `factory'
/usr/local/Library/Homebrew/formulary.rb:230:in `from_rack'
/usr/local/Library/Homebrew/formula.rb:1141:in `block in installed'
/usr/local/Library/Homebrew/formula.rb:1139:in `map'
/usr/local/Library/Homebrew/formula.rb:1139:in `installed'
/usr/local/Library/Homebrew/diagnostic.rb:1153:in `check_missing_deps'
/usr/local/Library/Homebrew/cmd/doctor.rb:42:in `block in doctor'
/usr/local/Library/Homebrew/cmd/doctor.rb:35:in `each'
/usr/local/Library/Homebrew/cmd/doctor.rb:35:in `doctor'
/usr/local/Library/brew.rb:87:in `<main>'