Do not require a colon to close dynamic blocks.

src/compare/diff.rs

@@ -894,6 +894,8 @@ fn compare_dynamic_block<'s>(
         Ok(_) => {}
     };
 
+    // TODO: Compare :block-name :arguments
+
     for (emacs_child, rust_child) in children.iter().skip(2).zip(rust.children.iter()) {
         child_status.push(compare_element(source, emacs_child, rust_child)?);
     }

src/parser/dynamic_block.rs

@@ -1,14 +1,18 @@
 use nom::branch::alt;
 use nom::bytes::complete::is_not;
+use nom::bytes::complete::tag;
 use nom::bytes::complete::tag_no_case;
 use nom::character::complete::line_ending;
 use nom::character::complete::space0;
 use nom::character::complete::space1;
+use nom::combinator::consumed;
 use nom::combinator::eof;
 use nom::combinator::not;
 use nom::combinator::opt;
 use nom::combinator::recognize;
+use nom::multi::many0;
 use nom::multi::many_till;
+use nom::sequence::preceded;
 use nom::sequence::tuple;
 
 use super::org_source::OrgSource;
@@ -67,24 +71,23 @@ pub(crate) fn dynamic_block<'b, 'g, 'r, 's>(
     };
     let element_matcher = parser_with_context!(element(true))(&parser_context);
     let exit_matcher = parser_with_context!(exit_matcher_parser)(&parser_context);
-    let (remaining, children) = match tuple((
-        not(exit_matcher),
+    not(exit_matcher)(remaining)?;
+    let (remaining, leading_blank_lines) = opt(consumed(tuple((
         blank_line,
-        many_till(blank_line, exit_matcher),
-    ))(remaining)
-    {
-        Ok((remain, (_not_immediate_exit, first_line, (_trailing_whitespace, _exit_contents)))) => {
+        many0(preceded(not(exit_matcher), blank_line)),
+    ))))(remaining)?;
+    let leading_blank_lines =
+        leading_blank_lines.map(|(source, (first_line, _remaining_lines))| {
             let mut element = Element::Paragraph(Paragraph::of_text(first_line.into()));
-            let source = get_consumed(remaining, remain);
             element.set_source(source.into());
-            (remain, vec![element])
-        }
-        Err(_) => {
-            let (remaining, (children, _exit_contents)) =
-                many_till(element_matcher, exit_matcher)(remaining)?;
-            (remaining, children)
-        }
-    };
+            element
+        });
+    let (remaining, (mut children, _exit_contents)) =
+        many_till(element_matcher, exit_matcher)(remaining)?;
+    if let Some(lines) = leading_blank_lines {
+        children.insert(0, lines);
+    }
+
     let (remaining, _end) = dynamic_block_end(&parser_context, remaining)?;
 
     let source = get_consumed(input, remaining);
@@ -117,7 +120,8 @@ fn dynamic_block_end<'b, 'g, 'r, 's>(
     start_of_line(input)?;
     let (remaining, source) = recognize(tuple((
         space0,
-        tag_no_case("#+end:"),
+        tag_no_case("#+end"),
+        opt(tag(":")),
         alt((eof, line_ending)),
     )))(input)?;
     Ok((remaining, source))