http://d.puremagic.com/issues/show_bug.cgi?id=5376

           Summary: writeln doesn't print immutable lazy sequences
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2010-12-26 02:05:18 PST ---
import std.stdio, std.algorithm;
void main() {
    const(int[]) arr1 = [1, 2, 3];
    auto sequence1 = map!q{ -a }(arr1);
    writeln(sequence1);

    const sequence2 = map!q{ -a }(arr1);
    writeln(sequence2);

    immutable(int[]) arr2 = [1, 2, 3];
    immutable sequence3 = map!q{ -a }(arr2);
    writeln(sequence3);
}


DMD 2.051 prints:

[-1, -2, -3]
const(Map!(result,const(int[])))
immutable(Map!(result,immutable(int[])))


But I'd like it to print the contents of the second and third lazy sequences too, like (note the semicolons, very useful to tell apart arrays from lazy sequences, see bug 3813 for the rationale):

[-1; -2; -3]
[-1; -2; -3]
[-1; -2; -3]


Or maybe something like:

[-1; -2; -3]
const([-1; -2; -3])
immutable([-1; -2; -3])


But note that this is currently a syntax error:

void main() {
    auto a = const([1, 2, 3]);
}

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http://d.puremagic.com/issues/show_bug.cgi?id=5376


Simen Kjaeraas <simen.kjaras@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simen.kjaras@gmail.com


--- Comment #1 from Simen Kjaeraas <simen.kjaras@gmail.com> 2010-12-26 04:05:14 PST ---
This is the same old problem of ranges not supporting tail-const or
tail-immutable.
I've filed that as a separate issue -
http://d.puremagic.com/issues/show_bug.cgi?id=5377

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