Asciidoctor compatibility for part of readme

README.asciidoc

@@ -372,21 +372,21 @@ Longer `partintro` blocks should be wrapped in an
 http://www.methods.co.nz/asciidoc/userguide.html#X29[_open block_]
 which starts and ends with two dashes: `--`:
 
-[source,asciidoc]
+["source","asciidoc",subs="attributes,callouts,macros"]
 ----------------------------------
 = Part two                  # level 0
 
 [partintro]
 .A partintro title
--- <1>
+pass:[--] <1>
 This section may contain multiple paragraphs.
 
 [float]
-== A header should use `[float]`
+== A header should use [float]
 
 Everything up to the closing -- marker
 will be considered part of the partintro.
--- <1>
+pass:[--] <1>
 
 == Chapter title           # level 2
 

integtest/Makefile

@@ -46,7 +46,7 @@ readme_expected_files: /tmp/readme_asciidoc
 		<(cd /tmp/$*_asciidoctor && find * -type f | sort)
 	# The grep -v below are for known issues with asciidoctor
 	for file in $$(cd /tmp/$*_asciidoc && find * -type f -name '*.html' \
-			| grep -v 'blocks\|changes\|experimental\|multi-part'); do \
+			| grep -v 'blocks\|changes\|experimental'); do \
 		./html_diff /tmp/$*_asciidoc/$$file /tmp/$*_asciidoctor/$$file; \
 	done