Q: Any C IDE that compiles in RAM

The old Turbo Pascal did everything in RAM after the inital load. Even the library was kept in RAM so the linker didn't touch the disk.

Do any C IDE's do that?

Or any IDE for any language?

Python IDLE makes me save my file each time I run it. That seems contrary to the interactive shell principle. It should let me pass the file from the editor to the shell without saving it. And it should cache the libraries in RAM if it
doesn't already. Is there a way to make IDLE work in RAM like this?

SLIME doesn't make you save a file to load your code in. Squeak doesn't. Neither does most anything with a REPL.