[nem-en] List comprehensions ranges

[Sandro Magi]

Fore completeness: in mathematics, '[' is inclusive, and '(' is
exclusive. Thus:

(0 .. 5)
1,2,3,4

[0 .. 5)
0,1,2,3,4

[0 .. 5]
0,1,2,3,4,5

Although the syntax proposed below is easier to parse.

Sandro

Kamil Skalski wrote:
> We had similar request / discussion here
> http://nemerle.org/forum/viewtopic.php?t=220
> The last post gives some nicer syntax:
> 
> for (0 <= i < 3)           // 0, 1, 2
> for (0 <= i <= 3)          // 0, 1, 2, 3
> for (0 <= i < 7 step 2)    // 0, 2, 4, 6
> for (0 <= i < 3 step -1)   // 2, 1, 0
> 
> I guess this could be dressed as
> foreach (i in $[0 <= i < arr.Length])
>   arr [i]
> 
> or something similar.
> 
>>
>> Programming Language Ruby has following syntax.
>>
>> 0 .. 5  : 1 2 3 4 5
>> 0 ... 5 : 1 2 3 4
> 
> The problem is that such syntax differences are quite unintuitive and
> hard to read...
> 
> -- 
> Kamil Skalski
> http://nazgul.omega.pl
> 
> 
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