Create structure for line breaks.

src/parser/mod.rs

@@ -25,6 +25,7 @@ mod latex_environment;
 mod latex_fragment;
 mod lesser_block;
 mod lesser_element;
+mod line_break;
 mod list;
 mod object;
 mod object_parser;
@@ -87,6 +88,7 @@ pub use object::InlineBabelCall;
 pub use object::InlineSourceBlock;
 pub use object::Italic;
 pub use object::LatexFragment;
+pub use object::LineBreak;
 pub use object::Object;
 pub use object::OrgMacro;
 pub use object::PlainLink;