reduce a BitArray[]

[Alex Parrill via Digitalmars-d-learn]

On Tuesday, 29 December 2015 at 09:26:31 UTC, Alex wrote:
> The problem is, that the last line with the reduce does not 
> compile. Why?

If you get an error, it is imperative that you tell us what it is.

For the record, this code:

	import std.bitmanip;
	import std.stdio;
	import std.algorithm;
	
	void main() {
		
		BitArray[] arr7 = [BitArray([0, 1, 0, 1, 0, 1]), BitArray([0, 
1, 0, 0, 0, 0]), BitArray([0, 1, 0, 1, 0, 0]), BitArray([0, 1, 0, 
1, 0, 0])];
	
		BitArray common = BitArray([1,1,1,1,1,1]);
		foreach(BitArray ba; arr7)
		{
			common &=  ba;
		}
		writeln("common2: ", common);
		
		writeln("common1: ", reduce!((a,b) => a & b)(arr7));
	}

Gives me the error:

/opt/compilers/dmd2/include/std/algorithm/iteration.d(2570): 
Error: variable f868.main.F!(__lambda1).e cannot be declared to 
be a function
/opt/compilers/dmd2/include/std/meta.d(546): Error: template 
instance f868.main.F!(__lambda1) error instantiating
/opt/compilers/dmd2/include/std/algorithm/iteration.d(2477):      
   instantiated from here: staticMap!(ReduceSeedType, __lambda1)
/d486/f868.d(16):        instantiated from here: 
reduce!(BitArray[])
/d486/f868.d(16): Error: template std.algorithm.iteration.reduce 
cannot deduce function from argument types !((a, b) => a & 
b)(BitArray[]), candidates are:
/opt/compilers/dmd2/include/std/algorithm/iteration.d(2451):      
   std.algorithm.iteration.reduce(fun...) if (fun.length >= 1)

On 2.069.1 (dpaste: http://dpaste.dzfl.pl/8d7652e7ebeb). I don't 
have time ATM to diagnose it further. It definitely shouldn't be 
that cryptic of an error message.