bugKawa - Bugs: bug #27037, Typed lambda-lists

 
 

bug #27037: Typed lambda-lists

Submitter:  Helmut Eller <ellerh>
Submitted:  Wed 15 Jul 2009 07:22:06 PM UTC
   
 
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open
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Wed 15 Jul 2009 07:22:06 PM UTC, original submission:  

The lambda-list parsing seems to be
a bit to DWIM-ish.  Consider this example:

(define (funky-return-type x)
  ((lambda (arg) arg 3) x))

While some fun can be had with

(funky-return-type java.lang.String) => "3"
(funky-return-type java.lang.Object) => 3

it wears of quickly after:

(funky-return-type #t) => java.lang.ClassCastException

The example isn't entirely made up because the idiom
(lambda (arg) arg ...) is commonly used to mark arg as
ignorable variable.

Helmut Eller <ellerh>

 

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