The bugs caused by fallthrough are typically mistakes made only by beginners. Fallthrough is not such a significant shortcoming that requires replacing  with a new keyword. If every defect in C++ keywords (like switch) were to be addressed by redefining new keywords, wouldn¡¯t the number of keywords in C++ grow endlessly over time?

For example, since C++'s try...catch... construct lacks a finally block, does this mean we need to introduce a new set of keywords.