One debugger feature I thought of while writing the comment was the ?? command in windbg. That takes an expression and evaluates it. Gdb also does this which I'

One debugger feature I thought of while writing the comment was the ?? command in windbg. That takes an expression and evaluates it. Gdb also does this which I've used with the "print" command to print a C expression, including pointer casts and such. That would obviously require language support. But then again you don't need to code everything in the same language either. You could write a rust parser in another language. Or a modular interface to dispatch knowledge of a programming language (does Microsoft's "language server" concept work this way?)