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Developers frequently make code changes while programming, such as deleting a line of code and renaming or introducing a variable. These changes can be detected and logged, for example by the IDE used by the developer. Logging changes is possible at two levels: at the textual level or at the level of the abstract syntax tree (AST) of the program. The logged changes, in both forms, are useful because they can be used to build new software engineering tools, such as static code analysers. Pluginsdoi:10.5281/zenodo.6326893 fatcat:eap7vi3c5fgi5jwhisgaulr3ka