Mark Vander Stel authored
Without these functions defined, each prompt invocation would force the shell to check if the command was valid, and generate an error message if it was not. We know that it won't be, so we can shortcut that by setting it as such. More importantly, if the Bash function command_not_found_handle() is set, it will be executed for each function that is not set. For Git or HG, this is only one. But for SVN, it is enough to lock the prompt for a while. Fixes #696
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