Viivi 00.17 release notes

Version 00.17.01 has been improved at the following points compared to the previous version 00.16.00.

• Behaviors of the procedures define and set! applied to the "system-predefined symbols" were corrected.
  
  
  • define
    It was modified to show a warning message only when the procedure define overrides the binding of a system-predefined symbol at the top-level.
    
  
  
  • set!
    The procedure set! was enabled to override the bindings of the system-predefined symbols.
    Similar to the procedure define, a warning message is shown when the procedure set! overrides the binding of a system-predefined symbol.
    
  
  

  [Examples]
  > (define cos +) ;; cos is a system-predefined symbol

/// >>Warning<<
/// The procedure #<procedure:define> overrode the binding of the system-predefined symbol cos with the new value #<procedure:+>.
/// Continuing the process...

#<unspecified>
> (let ((sin #f)) (define tan /) (tan 30)) ;; No warning messages are shown here, as tan is bound in the local scope of let.
1/30
> (let ((sin #f)) (set! tan -) (tan 30)) ;; tan is a system-predefined symbol

/// >>Warning<<
/// The procedure #<procedure:set!> overrode the binding of the system-predefined symbol tan with the new value #<procedure:->.
/// Continuing the process...

-30
> (let ((sin #f)) (set! sin sqrt) (sin 30)) ;; No warning messages are shown here, as sin is a local symbol of let.
5.477225575051661
>




• Small bug fixes.


• Minor corrections on the messages.