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3.1 Blocks

Blocks can be created using the make-block* function. 

(define ruby-hello-world
  (make-block* #:code "print 42"
               #:language ruby))

A define-block macro is provided as a shorthand. 

(define-block ruby-hello-world
  #:code "print 42"
  #:language ruby)

Blocks are immutable. Functions which take and return a block are returning new blocks. Blocks can not be modified after they are created.