Your package R-testthat failed to build from source in current rawhide. https://koji.fedoraproject.org/koji/taskinfo?taskID=17701115 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
Created attachment 1251295 [details] build.log
Created attachment 1251296 [details] root.log
Created attachment 1251297 [details] state.log
zbyszek's R-testthat-0.11.0-4.fc26 completed http://koji.fedoraproject.org/koji/buildinfo?buildID=840231