GC might miss marking some functions

[tiendo1011]

In chapter 26, In the implementation of markCompilerRoots, the GC only mark the functions outward from the current function, what about function next to it (its sibling)?

For example:

fun a() {}
fun b() {}

When compiling b, let's say it triggers a garbage collection, markCompilerRoots will not mark a to avoid it from being collected. Isn't it supposed to do so?

[tiendo1011]

It seems that a will be marked because it's in the enclosing function constants list, since the enclosing function will be marked, its constants will be marked too.