PVS-Studio analyzed the Clang compiler source code and found several copy-paste errors introduced by duplicating code fragments without updating variable names or logic. The errors included identical expressions on both sides of logical operators, functions clearing the wrong variable, and missing breaks in switch statements. PVS-Studio also flagged some potentially erroneous or suspicious code that may or may not be bugs, such as redundant checks or assignments. The analysis demonstrates issues that can arise from copy-pasting code without modification and highlights opportunities for Clang developers to improve quality through further review.