Re: [COMMITTED] libpoke, testsuite, doc: support for lambda expressions

[Egeyar Bagcioglu]

> This commit adds support for lambda expressions to Poke.  Lambda
> expressions use the following simple syntax:
>
>    lambda FUNCTION_SPECIFIER
>
> Where a FUNCTION_SPECIFIER is the same notation that one would use
> when defining a function in a `fun' construction.  Examples:
>
>   (poke) lambda void: {}
>   #<closure>
>   (poke) lambda (int i) int: { return i + 2; }
>   #<closure>
>
> Lambdas can be invoked like any other function value:
>
>   (poke) lambda void: {} ()
>   (poke) lambda (int i) int: { return i + 2; } (10)
>   12
>
> Lambdas can also be stored in variables:
>
>   (poke) var la = lambda (int i) int: { return i + 2; }
>   (poke) la (10)
>   12

this is so cool!