5.8 Procedures and Macros

• Lambda: Basic procedure creation using lambda.
• Primitive Procedures: Procedures defined in C.
• Optional Arguments: Handling keyword, optional and rest arguments.
• Procedure Properties: Procedure properties and meta-information.
• Procedures with Setters: Procedures with setters.
• Macros: Lisp style macro definitions.
• Syntax Rules: Support for R5RS syntax-rules.
• Syntax Case: Support for the syntax-case system.
• Internal Macros: Guile's internal representation.