Disallow list item starting with multiple blank lines.
See jgm/CommonMark#332
diff --git a/src/blocks.c b/src/blocks.c
index c466fc2..9a8a9a6 100644
--- a/src/blocks.c
+++ b/src/blocks.c
@@ -635,7 +635,10 @@
S_advance_offset(parser, &input, container->as.list.marker_offset +
container->as.list.padding,
true);
- } else if (parser->blank) {
+ } else if (parser->blank && container->first_child != NULL) {
+ // if container->first_child is NULL, then the opening line
+ // of the list item was blank after the list marker; in this
+ // case, we are done with the list item.
S_advance_offset(parser, &input,
parser->first_nonspace - parser->offset, false);
} else {
