[ nice-Bugs-888229 ] equals dispatching on exact type

Bugs item #888229, was opened at 2004-01-31 18:57
Message generated for change (Comment added) made by bonniot
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=112788&aid=888229&group_id=12788

Category: None
Group: None
Status: Open
Resolution: Accepted
Priority: 5
Submitted By: Isaac Gouy (igouy)
Assigned to: Nobody/Anonymous (nobody)
Summary: equals dispatching on exact type

Initial Comment:
   class A { int i = 0; }
   class B extends A { int k = 0; }

   equals (#A x, #A y) = x.i == y.i;

   equals (#B x, #B y) = x.k == y.k; 

   void main(String[] args){ 
      let a = new A();
      let b = new B();  

      println( a.equals(a) );
      println( a.equals(b) );
      println( b.equals(a) );
      println( b.equals(b) );
   }


\Nice\Test>java -jar t.jar
   true
   false
   true
   true

Nice compiler version 0.9.6 prerelease (build 2004.01.30, 
19:05:54 UTC)

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>Comment By: Daniel Bonniot (bonniot)
Date: 2004-02-01 23:39

Message:
Logged In: YES 
user_id=88952

Sorry about the "BTW", I did not read nice-info before!


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Comment By: Daniel Bonniot (bonniot)
Date: 2004-02-01 22:49

Message:
Logged In: YES 
user_id=88952

Right, the third value is incorrect, it should be false (the
three others are correct). I checked the bytecode, this is
specific to methods that are declared in Java (like equals,
in java.lang.Object) and that # dispatch on their first
argument.

BTW, it would be nice in general to get some comment with
the report, like why you consider it a bug (when it's not
obvious as with runtime exceptions).


----------------------------------------------------------------------

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https://sourceforge.net/tracker/?func=detail&atid=112788&aid=888229&group_id=12788


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