5c799ef8c8
When a dependency of a formula specified on the command-line is also specified, *after* the dependent formula, installation proceeds as part of the dependent's dependency tree and then is attempted again because the user asked for it explicitly. This results in the installer raising a CannotInstallFormulaError because it has already been installed. For example: $ brew install graphviz pkg-config ==> Installing graphviz dependency: pkg-config ... ==> Installing graphviz ... Error: pkg-config-0.27.1 already installed We already have a mechanism for dealing with this, but it does not kick in early enough. Move the installation attempt check into FormulaInstaller#check_install_sanity and catch the exception in the appropriate places. Fixes Homebrew/homebrew#16957.
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