// definitions of that symbol. See issue #42396 for details.
//
// As currently implemented, this is a fatal error. This has drawbacks
// in that if there are multiple missing builtins, the error will only
// cite the first one. On the plus side, terminating the link here has
// advantages in that we won't run the risk of panics or crashes later
// on in the linker due to R_CALL relocations with 0-valued target
// symbols.