prolog-parse-mode

prolog-parse-mode is a variable defined in `prolog.el'.
Its value is

beg-of-clause

Documentation:
The parse mode used (decides from which point parsing is done).
Legal values:
'beg-of-line - starts parsing at the beginning of a line, unless the
previous line ends with a backslash. Fast, but has
problems detecting multiline /* */ comments.
'beg-of-clause - starts parsing at the beginning of the current clause.
Slow, but copes better with /* */ comments.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.