A code block is enclosed by the begin and end keywords. Let's examine what the abstract syntax tree looks like.

The head node just contains a block symbol. When there are multiple lines in the block, the abstract syntax tree also includes line number nodes. In this example, there is a LineNumberNode with line 2 preceding the first call to println. Likewise, there is another LineNumberNode with line 3 preceding the second call to println. The LineNumberNode nodes do not do anything, but they are useful for stack traces and debugging.