Rationale: GUILE already supports a number of escapes not defined in the Scheme standard. Emacs Lisp modes and derivative modes treat opening parens in the first column of a file specially, resynchronizing function boundaries. The respective manual entry states:
<URL:http://www.gnu.org/software/emacs/manual/html_node/emacs/Left-Margin-Paren.html> Being able to escape opening parens makes it possible to write Emacs-friendly Guile code. -- David Kastrup
