http://d.puremagic.com/issues/show_bug.cgi?id=4803

           Summary: std.range.chain with const string arguments
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: bearophile_hugs@eml.cc


--- Comment #0 from bearophile_hugs@eml.cc 2010-09-03 09:53:22 PDT ---
A problem found by Pelle Mansson:


import std.range: chain;
void main() {
  const string s = "hello";
  auto r = chain(s, s);
}


Compiled with dmd 2.048:

...\dmd\src\phobos\std\range.d(1162): Error: can only initialize const member
_field_field_0 inside constructor
...\dmd\src\phobos\std\range.d(1162): Error: can only initialize const member
_field_field_1 inside constructor


I think a chain() has to work with const strings too (the items need to be
const if one of the iterables given to chain has const items).

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich@gmail.com


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2010-09-03 10:29:52 PDT ---
What exactly is the purpose of a constant string type?

That type evaluates to const(immutable(char)[]), which wouldn't make much sense
to me.

Note that this will work:

import std.range: chain;
void main() {
    const (char)[] s = "hello";
    auto r = chain(s, s);
}

But I'm not sure if that's what you were after.

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--- Comment #2 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2010-09-03 10:35:43 PDT ---
(In reply to comment #1)
> What exactly is the purpose of a constant string type?
> 
> That type evaluates to const(immutable(char)[]), which wouldn't make much sense
> to me.
> 
> Note that this will work:
> 
> import std.range: chain;
> void main() {
>     const (char)[] s = "hello";
>     auto r = chain(s, s);
> }
> 
> But I'm not sure if that's what you were after.

Woops, my bad. A string is still appendable, and a const one would not be. I think I understand now.

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Andrei Alexandrescu <andrei@metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |andrei@metalanguage.com
         AssignedTo|nobody@puremagic.com        |andrei@metalanguage.com


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SomeDude <lovelydear@mailmetrash.com> changed:

           What    |Removed                     |Added
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                 CC|                            |lovelydear@mailmetrash.com


--- Comment #3 from SomeDude <lovelydear@mailmetrash.com> 2012-04-21 15:34:49 PDT ---
Compiles on 2.059

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED


--- Comment #4 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-04-21 15:39:19 PDT ---
(In reply to comment #3)
> Compiles on 2.059

Thanks for testing.

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