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Contains the tags in a module for the module extension currently being processed. This object has a field for each tag class of the extension, and the value of the field is a list containing an object for each tag instance. This "tag instance" object in turn has a field for each attribute of the tag class. When passed as positional arguments to print() or fail(), tag instance objects turn into a meaningful string representation of the form "'install' tag at /home/user/workspace/MODULE.bazel:3:4". This can be used to construct error messages that point to the location of the tag in the module file, e.g. fail("Conflict between", tag1, "and", tag2).