mxcl/homebrew — pull request #10281 by LeFnord (2012-02-17 20:23:42+00:00)
Title: add to string cast by checking if an url passed in in formula.rb:351

prevent such an error:

Error: undefined method `=~' for #
Please report this bug:
https://github.com/mxcl/homebrew/wiki/checklist-before-filing-a-new-issue
/usr/local/Library/Homebrew/formula.rb:351:in `factory'