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digitalmars.D.bugs - [Issue 611] New: IsExpression fails when inside implemented interface

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=611

           Summary: IsExpression fails when inside implemented interface
           Product: D
           Version: 0.175
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: daekharel gmail.com


interface Interface(T) {
    static assert(is(T : Interface));
}

class Implementor : Interface!(Implementor) {}

-----
The above code generates the following error when compiling:

err.d(2): static assert  (is(Implementor : Interface)) is false

The assertion is self-evidently true; Implementor subtypes
Interface!(Implementor), so is(Implementor : Interface!(Implementor)) should be
true. This error occurs only when the assertion is contained within the
interface itself; if it is placed within the Implementor class definition or
outside, it compiles.


--
Nov 27 2006
next sibling parent Thomas Kuehne <thomas-dloop kuehne.cn> writes:
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d-bugmail puremagic.com schrieb am 2006-11-27:

 http://d.puremagic.com/issues/show_bug.cgi?id=611



 interface Interface(T) {
     static assert(is(T : Interface));
 }

 class Implementor : Interface!(Implementor) {}

 -----
 The above code generates the following error when compiling:

 err.d(2): static assert  (is(Implementor : Interface)) is false

 The assertion is self-evidently true; Implementor subtypes
 Interface!(Implementor), so is(Implementor : Interface!(Implementor)) should be
 true. This error occurs only when the assertion is contained within the
 interface itself; if it is placed within the Implementor class definition or
 outside, it compiles.


Added to DStress as
http://dstress.kuehne.cn/compile/i/is_15_A.d
http://dstress.kuehne.cn/compile/i/is_15_B.d
http://dstress.kuehne.cn/compile/i/is_15_C.d
http://dstress.kuehne.cn/compile/i/is_15_D.d
http://dstress.kuehne.cn/compile/i/is_15_E.d
http://dstress.kuehne.cn/compile/i/is_15_F.d
http://dstress.kuehne.cn/compile/i/is_15_G.d
http://dstress.kuehne.cn/compile/i/is_15_H.d
http://dstress.kuehne.cn/compile/i/is_15_I.d
http://dstress.kuehne.cn/compile/i/is_15_J.d
http://dstress.kuehne.cn/compile/i/is_15_K.d

Thomas


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Nov 29 2006
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=611


Andrei Alexandrescu <andrei metalanguage.com> changed:

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


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Nov 26 2010
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=611


Tim Shea <tim.m.shea gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tim.m.shea gmail.com



Please correct me if I'm wrong, but this does not seem incorrect to me. In
fact, if the static assert compiles and passes outside the interface, I would
think that would be an issue. After all:

interface MyInterface(T) {
  static assert(is(T : MyInterface));
}
MyInterface(int) a;

Should compile to :

interface MyInterface(Int) {
  static assert(is(int : MyInterface(int));
}

This seems self evidently false to me. An integer does not convert to a
MyInterface(int), nor should it. Regardless of where the static assert is, I
would think it should fail.

I guess if you have something like:

interface Cloneable(T) {
  T clone();
}

then it makes sense to say:

class CloneableObject : Cloneable(CloneableObject) {...}

but I don't think it follows that a Cloneable(CloneableObject) should be
convertible back to a plain CloneableObject.

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Mar 19 2012