target  : (2,0x48) FnCDblVar
status  : emitted
from    : discovery snippet 'cast_Var_CDbl' (minimised)

' ---- modProbe.bas
Option Explicit

Public Sub Main()
  Dim a As Variant, c As Double
  c = CDbl(a)
End Sub

target disasm lines:
  modProbe.Sub Main | 40144F    FC48                  FnCDblVar
