What he probably meant is that compilation is available at runtime to the user, allowing you to JIT stuff at will. This is how https://github.com/marcoheisig/P

What he probably meant is that compilation is available at runtime to the user, allowing you to JIT stuff at will. This is how https://github.com/marcoheisig/Petalisp#why-is-petalisp-written-in-common-lisp https://github.com/marcoheisig/Petalisp#why-is-petalisp-writ... and https://github.com/numcl/specialized-function https://github.com/numcl/specialized-function can exist.