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digitalmars.D.learn - In Expression for Static and DYnamic Arrays

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Why the `in` expression can only be applied to associative
arrays and cannot be used with static or dynamic arrays as
it is possible with, _e.g._, Python?

The following code is not legal:
int[] a = [1,2,3,4,5];
if (1 in a) { }
Are there any technical explanation for this limitation? 

Thanks, Rizo.

BF6F0265: FB27 BB4C 8F03 4980 C311 0968 E66B 9831 BF6F 0265
Oct 11 2012