Summary: foreach requires front to be a function in a range
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD

--- Comment #0 from Steven Schveighoffer <> 2011-01-03 
07:25:54 PST ---
This is a valid range:

import std.range;

struct S
    int front;
    bool empty;
    void popFront() {empty = true;}

static assert(isInputRange!S);  // compiles

But this fails:

void main()
    S s;
    foreach(int i; s) { }

fails with the following error:

Error: no property 'opApply' for type 'S'
Error: opApply() function for S must return an int

Change front to:

@property int front() {return 0;}

and it compiles.  Clearly empty is not required to be a function, and there is
no mention of any function requirements in the spec, it's just stated that they
must be properties.

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