cperl-emulate-lazy-lock is an interactive compiled Lisp function in `cperl-mode.el'.

(cperl-emulate-lazy-lock &optional WINDOW-SIZE)

Emulate `lazy-lock' without `condition-case', so `debug-on-error' works.
Start fontifying the buffer from the start (or end) using the given
WINDOW-SIZE (units is lines). Negative WINDOW-SIZE starts at end, and
goes backwards; default is -50. This function is not CPerl-specific; it
may be used to debug problems with delayed incremental fontification.