Remove [Makefile.preprocess], no longer needed.

demos/basic/Makefile

@@ -20,7 +20,7 @@ test: all
 mli:
 	@ $(OCAMLBUILD) $(MLI)
 
-include Makefile.preprocess
+include $(shell ocamlfind query visitors)/Makefile.preprocess
 
 processed: Term.processed.ml
 

demos/basic/Makefile.preprocess

-# This Makefile allows running visitors as a preprocessor,
-# so as to inspect the generated code and possibly include
-# it in a TeX document.
-
-# This assumes the visitors package is installed.
-
-# The rewriting command.
-PPX          := `ocamlfind query ppx_deriving`/ppx_deriving \
-                `ocamlfind query visitors`/ppx_deriving_visitors.cma
-REWRITE      := ocamlfind ppx_tools/rewriter -ppx '$(PPX)'
-
-# Use GNU sed to extract the generated code.
-# This requires GNU sed 3.95 or above, I am told.
-SED          := $(shell if command -v gsed >/dev/null ; then echo gsed ; else echo sed ; fi)
-EXTRACT      := $(SED) -e '/VISITORS.BEGIN/,/VISITORS.END/!d;//d'
-
-# Use sed to fix some deficiencies of OCaml's code printer.
-# 0. Force a space after a comma.
-# 1. Replace multiple consecutive spaces with a single space.
-# This will destroy indentation; we restore it afterwards.
-# 2. Force a line break after [in].
-# 3. Force a line break after [->].
-# 4. (Ad hoc.) Force a line break between [= let],
-#    presumably at the beginning of a method definition.
-# 5. Remove the line break between [=] and [object].
-BEAUTIFY     := \
-              | $(SED) -e 's/,/, /g' \
-              | $(SED) -e 's/  / /g' \
-              | $(SED) -e 's/ in / in\n/g' \
-              | $(SED) -e 's/ -> / ->\n/g' \
-              | $(SED) -e 's/= let /=\nlet /g' \
-              | perl -0777 -pe 's/=\n *object/= object/gs' \
-
-# Use ocp-indent to beautify the generated code.
-INDENT       := ocp-indent --config=JaneStreet,match_clause=4
-
-%.processed.ml: %.ml
-	$(REWRITE) $< | $(EXTRACT) $(BEAUTIFY) | $(INDENT) > $@