Confusing AnyRef equals

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I found that subj returns false for the same object. It is a terrible 
mistake for me

case class a(i:Int)
{
  override def canEqual(a: Any) = a.isInstanceOf[a]

  override def equals(o:Any) = AnyRef.equals(o)

  override def hashCode = AnyRef.hashCode
}

val aa = new a(1)
aa == aa //false


Am I right? )

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<div dir=3D"ltr"><div class=3D"IVILX2C-ed-a" style=3D"padding-left: 5px;"><=
div tabindex=3D"0" class=3D"IVILX2C-nb-P" style=3D"line-height: normal;"><d=
iv style=3D"overflow: auto;"><div style=3D"max-height: 10000px;"><div dir=
=3D"ltr">I found that subj returns false for the same object. It is a terri=
ble mistake for me<div><br><div><pre style=3D"color: rgb(0, 0, 0); font-fam=
ily: &quot;Courier New&quot;;"><span style=3D"color: rgb(0, 0, 128); font-w=
eight: bold;">case class </span>a(i:Int)<br>{<br>  <span style=3D"color: rg=
b(0, 0, 128); font-weight: bold;">override def </span>canEqual(a: Any) =3D =
a.isInstanceOf[a]<br><br>  <span style=3D"color: rgb(0, 0, 128); font-weigh=
t: bold;">override def </span>equals(o:Any) =3D <span style=3D"color: rgb(1=
02, 14, 122); font-style: italic;">AnyRef</span>.equals(o)<br><br>  <span s=
tyle=3D"color: rgb(0, 0, 128); font-weight: bold;">override def </span>hash=
Code =3D <span style=3D"color: rgb(102, 14, 122); font-style: italic;">AnyR=
ef</span>.hashCode<br>}<br><br><span style=3D"color: rgb(0, 0, 128); font-w=
eight: bold;">val </span>aa =3D <span style=3D"color: rgb(0, 0, 128); font-=
weight: bold;">new </span>a(<span style=3D"color: rgb(0, 0, 255);">1</span>=
)<br>aa =3D=3D aa <span style=3D"color: rgb(128, 128, 128); font-style: ita=
lic;">//false</span></pre><pre style=3D"color: rgb(0, 0, 0); font-family: &=
quot;Courier New&quot;;"><span style=3D"color: rgb(128, 128, 128); font-sty=
le: italic;"><br></span></pre><pre style=3D"color: rgb(0, 0, 0); font-famil=
y: &quot;Courier New&quot;;"><span style=3D"color: rgb(128, 128, 128); font=
-style: italic;">Am I right? )</span></pre></div></div></div></div></div></=
div><div></div><div></div></div><div><div class=3D"IVILX2C-ed-a" style=3D"m=
argin-left: 44px; padding-left: 5px;"></div></div><div class=3D"IVILX2C-nb-=
b" style=3D"padding-left: 5px;"><div class=3D"IVILX2C-nb-a IVILX2C-nb-cb" s=
tyle=3D"padding-top: 4px; padding-bottom: 4px; position: relative;"><div st=
yle=3D"display: inline-block;"></div><div class=3D"IVILX2C-md-a" style=3D"m=
argin-top: 4px; position: relative; height: 34px;"></div></div></div></div>

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