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digitalmars.D.bugs - [Issue 900] New: changing import order causes type mismatch

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           Summary: changing import order causes type mismatch
           Product: D
           Version: 1.004
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: torhu yahoo.com


Tested with DMD 1.0 and 1.004 on winxp.

There are 4 files involved:

// palette.d
module palette;

struct RGB { }

=========================================
// color_inl.d
module color_inl;

//uncommenting this line will fix the problem
//import palette : RGB:

import color;

void _set_color(RGB* p) { }

=========================================
// color.d
module color;

// swapping the order of these two lines will also fix the problem
public import color_inl;
import palette : RGB;

=========================================
// dtest.d
import color;

void fade()
{
   RGB rgb;
   _set_color(&rgb);
}

void main() {}

========================================

C:\prog\test\D\bugtest>dmd test.d
test.d(6): function color_inl._set_color (int,RGB*) does not match parameter
types (int,RGB *)
test.d(6): Error: cannot implicitly convert expression (& rgb) of type RGB * to
RGB*


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Jan 28 2007
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torhu yahoo.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|rejects-valid               |




------- Comment #1 from torhu yahoo.com  2007-01-29 02:34 -------
Are selective imports private by default or not?  The docs state that imports
are public by default, but also says that selective imports are "bound into the
current namespace".

I take it they are supposed to be private, which means this bug is really about
the compiler accepting invalid code, since color_inl.d and dtest.d are able to
use RGB without importing palette.d.


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------- Comment #2 from larsivar igesund.net  2007-01-29 03:59 -------
Imports are private by default, if the spec says anything else, create a bug
report for it.


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------- Comment #3 from torhu yahoo.com  2007-01-29 17:42 -------
(In reply to comment #2)
The problem is that I don't know if "bound into the current namespace" implies
that it's also automatically exported as part of the importing module.

Probably it shouldn't imply that, since the point of selective imports seems to
be to avoid name conflicts in the importing module.

But this still confuses me, so I think there should be a clarification in the
docs.  At least so we know what is correct when the compiler is somewhere in
between.


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------- Comment #4 from torhu yahoo.com  2007-04-03 13:00 -------
(In reply to comment #2)
 A couple of bug reports here that suggest that selective, static, and renamed
imports are meant to be be private.

http://d.puremagic.com/issues/show_bug.cgi?id=604
http://d.puremagic.com/issues/show_bug.cgi?id=314

The question remains whether this is intended, or not.  In DMD, they are
currently public.  Were they supposed to be private?  The docs don't say.


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Leandro Lucarella <llucax gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |llucax gmail.com


--- Comment #5 from Leandro Lucarella <llucax gmail.com> 2009-11-13 15:50:57
PST ---
I think the spec is quite clear:

  [...]
  Public Imports

  By default, imports are private. [...]

http://www.digitalmars.com/d/1.0/module.html#ImportDeclaration

Static, renamed and selective import are all *import*, so it looks like they
all should be private by default (for the same reason basic imports are).

This bug is old and doesn't look very useful, I think it should be closed.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Jesse Phillips <Jesse.K.Phillips+D gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Jesse.K.Phillips+D gmail.co
                   |                            |m


--- Comment #6 from Jesse Phillips <Jesse.K.Phillips+D gmail.com> 2010-03-29
16:42:17 PDT ---
I seem to have run across this in DMD 2.042. Here a static assert fails with
the error:

=====================
C:\opt\dmd\windows\bin\..\..\src\phobos\std\typecons.d(424): Error: static
assert  (is(Tuple!(string,float) == Tuple!(string,float))) is false

C:\opt\dmd\windows\bin\..\..\src\phobos\std\typecons.d(413): 
instantiated from here: Tuple!(string,float)

C:\opt\dmd\windows\bin\..\..\src\phobos\std\typecons.d(423): 
instantiated from here: slice!(1,3)

C:\opt\dmd\windows\bin\..\..\src\phobos\std\typecons.d(420):
instantiated from here: Tuple!(int,string,float,double)

C:\opt\dmd\windows\bin\..\..\src\phobos\std\regex.d(260):
instantiated from here: Tuple!(string,string)

C:\opt\dmd\windows\bin\..\..\src\phobos\std\regex.d(280):
instantiated from here: opCall!(string)

C:\opt\dmd\windows\bin\..\..\src\phobos\std\regex.d(1519):
instantiated from here: Regex!(char).\test2.d(7):
instantiated from here: regex!(string)
===================

--------------------------
// Place string after import test2 to make this work
import std.string;
import test2;

void main() {
    new TestMe();
}
------------------------------

--------------------
module test2;

import std.regex;

class TestMe {
    void test(string input) {
        auto foo = !match(input, regex("fish")).empty;
    }
}

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--- Comment #7 from Jesse Phillips <Jesse.K.Phillips+D gmail.com> 2010-04-15
14:23:31 PDT ---
My import issue is no longer in DMD 2.043, but the original submission's code
still doesn't work.

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dawg dawgfoto.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |dawg dawgfoto.de
         Resolution|                            |INVALID


--- Comment #8 from dawg dawgfoto.de 2012-02-14 05:03:30 PST ---
This is invalid because 'import palette : RGB;' introduces RGB as private
alias.
You cannot access it from color_inl.
Changing that to 'public import palette : RGB' will fix your problem.

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dawg dawgfoto.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |


--- Comment #9 from dawg dawgfoto.de 2012-02-14 05:29:54 PST ---
Sorry, I was using a wrong dmd version.
Changing it to 'public import palette : RGB' will fail because
of a forward reference error. This happens due to the cyclic import of color
and color_inc.

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