[Issue 11261] New: Can't infer types without explicit slice in foreach

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=11261

           Summary: Can't infer types without explicit slice in foreach
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: Jesse.K.Phillips+D at gmail.com


--- Comment #0 from Jesse Phillips <Jesse.K.Phillips+D at gmail.com> 2013-10-14 10:54:11 PDT ---
When using a range to proved a key-value tuple, the compiler is unable to infer
the key-value in a foreach when slice is not present (2). Using an array
continues to work (1). This functioned in 2.63.

import std.typecons;
import std.range;

class Container {
    alias Tuple!(string, "key", string, "value") Key;

    InputRange!Key opSlice() {
    // 1 Key[] opSlice() {
        Range r;
        return inputRangeObject(r);
        // 1 return [Key("myKey", "My Value")];
    }
    private struct Range {
        enum empty = false;
        auto popFront() {
        }
        auto front() {
            return Key("myKey", "myValue");
        }
    }
}

void main() {
    auto container = new Container();
    foreach(k,v; container)
    // 2 foreach(k,v; container[])
    { break; }
}

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