dbg_istk
delayed_to_external() -> term()
from_external(X1) -> term()
push(Bs, Ieval, Lc) -> term()
delayed_stacktrace() -> term()
delayed_stacktrace(X1, Ieval) -> term()
stack_frame(X1, SP) -> term()
backtrace(HowMany, Ieval) -> term()
in_use_p(Mod, Cm) -> term()