This is special case of #14840, but identified as a potential source of special-cases if the general case is hard to solve.

Compiling the following program:

package main import "sync" var initializeVariable = sync.OnceValue(func() string { return "THIS_IS_DEAD_CODE" }) func main() {}

should not link in logic for initializeVariable since the variable is dead.
This also applies to OnceFunc and OnceValues.

At present, OnceValue is unfortunately not a drop-in replacement for for sync.Once for initializing global variables.