[Issue 9867] New: Map opIndex is not usable with immutable types

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http://d.puremagic.com/issues/show_bug.cgi?id=9867

           Summary: Map opIndex is not usable with immutable types
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2013-04-03 11:49:33 PDT ---
import std.algorithm;

private immutable string[12] longMonthNames = [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December"
];

immutable shortMonthNames = map!(a => a[0..3])(longMonthNames[]);  // L24

void main()
{
    string jan = shortMonthNames[0];
}

test.d(24): Error: mutable method test.MapResult!(__lambda2,
immutable(char[])[]).MapResult.opIndex is not callable using a immutable object

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