This module defines types for a Ceylon Abstract Syntax Tree (AST), a hierarchical and immutable data structure that represents a Ceylon program. # Obtaining an AST There are two major ways to obtain an AST: ## Create it yourself You can of course construct the AST yourself. To reduce the amount of boilerplate code necessary, we *strongly* recommend using the [[`ceylon.ast.create` module|module ceylon.ast.create]]; this will, for example, allow you to write baseExpression("null") ...