progn<-_execute

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progn<-_execute

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    - Classes
      - class progn
        
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        progn<-_execute

progn <-_execute: -> unchecked

If progn<-members is empty, fail with the error last_is_no_function. Otherwise push a variable frame to limit the scope of a local var->assign, and execute the statements. Stop with failure if a statement fails. Finally evaluate the last element if it is a function and return either the last element or the result of the evaluation.