Has any other mainstream programming language like C or Java introduced such reserved keywords in a new release? I guess if C or Java were to do something like this it would cause a lot of hue and cry.

I remember when C++ had to introduce a keyword for automatic type inference they reused the 'auto' keyword instead of introducing a new keyword at the risk of breaking a lot of existing code.

How do other mainstream languages handle a scenario like this where a new keyword is required?