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The new scope_check scope guard is a generalization of scope_success and scope_fail and allows specifying arbitrary conditions for executing the scope exit action. The scope_success and scope_fail have been reimplemented in terms of scope_check and now also support arbitrary fail conditions. Added exception_checker and error_code_checker conditions for testing for an exception being thrown and for an error code, respectively. scope_success and scope_fail use exception_checker by default. Added tests for the new components.