function Morf takes widget w returns unit
    return w
endfunction

function A takes nothing returns nothing
    local widget w=GetTriggerWidget()
//...
    if Morf(w)==GetTriggerUnit() then
//...
    endif
//...
endfunction

function W2U takes widget w returns unit
  return w
  return null
endfunction

function IsWidgetUnit takes widget w returns boolean
  return GetUnitTypeId(W2U(w)) != 0
endfunction