pub fn eccopyredirs(s: &mut estate) -> Option<eprog>Expand description
Port of eccopyredirs(Estate s) from Src/parse.c:3003. Reads
the WC_REDIR run at s->pc, counts the wordcodes needed,
reserves space in ecbuf via ecispace, then re-walks s->pc
re-emitting each redir’s wordcodes into the reserved slot —
finally calls bld_eprog(0) to package the result as an Eprog.