How To Implement Closures?

As I understand, closures could be unboxed using a generated trampoline, like
mov rax, qword 12345678ABCDEFh ; 10 bytes function address
jmp rax ; 2 bytes
payload times N db 0 ; closure environment

Won't that mess code cache?

>>5
The best standard is C99 and it should be default. Forever.

But no. They ass-rape the standard every cumsucking decade just to troll and insult us.