Why "__UHEAP_FAILNEXT" doesn't work in UIQ??

I tried the following code in both S60 3rd SDK and UIQ3 SDK:

void CabcdefgAppView::ConstructL( const TRect& aRect )
{
        __UHEAP_MARK;   
   
        __UHEAP_FAILNEXT(3);
        TRAPD( err, DoSth() );
        if( err != KErrNone )
        {
   TInt e = err;
        }   
      
        __UHEAP_MARKEND;
        __UHEAP_RESET;
}

void CabcdefgAppView::DoSth()
{
   for( TInt i = 0; i < 10; i++ )
   {      
      HBufC* buf;   
      buf = HBufC::NewLC( 100 );      
      CleanupStack::PopAndDestroy();
   }
}


__UHEAP_FAILNEXT(3); will cause the memroy allocation leave in S60 3rd just as I expected. But in UIQ3 SDK, I can't see any leave. The return value of TRAPD( err, DoSth() ); is KErrNone, which is 0.

I tried to press ctrl+alt+shift+p to do some setting in UIQ emulator, but it either didn't make sense or I didn't set it right.

Did I miss something??

Thank you in advance.