http://d.puremagic.com/issues/show_bug.cgi?id=8584

           Summary: bug with std.range.zip? range with opEquals(const)
                    const not allowed inside zip
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: thelastmammoth@gmail.com


--- Comment #0 from thelastmammoth@gmail.com 2012-08-25 13:40:09 PDT ---
see http://forum.dlang.org/thread/ewhhutwupqxbepqyzhlr@forum.dlang.org#post-mailman.1402.1345925314.31962.digitalmars-d:40puremagic.com

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs@eml.cc


--- Comment #1 from bearophile_hugs@eml.cc 2012-08-26 10:25:06 PDT ---
I suggest to explain the problem here again, with a minimal example code of the problem too.

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--- Comment #2 from thelastmammoth@gmail.com 2012-08-26 10:45:02 PDT ---
copied form the above mentioned thread:


---
import std.range;
struct A{
    int x;
    //bool opEquals(const A a) {return a.x==x;} //comiles when this
is used
    //bool opEquals(const A a)const{return a.x==x;} //will not
compile
        bool opEquals(A a)const{return a.x==x;} //will not compile
}

struct Range(S){
    auto front(){return 0;}
    auto popFront(){}
    auto empty(){return false;}
}

void main(){
    auto a=Range!A();
    zip(a,a);
}
----

phobos/std/range.d(3449): Error: function
std.typecons.Tuple!(Range!(A),Range!(A)).Tuple.opEquals!(const(Tuple!(Range!(A),Range!(A)))).opEquals
(const(Tuple!(Range!(A),Range!(A))) rhs) is not callable using
argument types (const(Tuple!(Range!(A),Range!(A)))) const
phobos/std/range.d(3811): Error: template instance
std.range.Zip!(Range!(A),Range!(A)) error instantiating
scratchd(26):        instantiated from here:
zip!(Range!(A),Range!(A))
test_scratch.d(26): Error: template instance
std.range.zip!(Range!(A),Range!(A)) error instantiating

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