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


bug #27037: Typed lambda-lists

Submitted by:  Helmut Eller <ellerh>
Submitted on:  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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