target  : (1,0xEE) FnLenBStr
status  : emitted
from    : discovery snippet 'fn_Str_LenB' (minimised)

' ---- modProbe.bas
Option Explicit

Public Sub Main()
  Dim a As String, c As Variant
  c = LenB(a)
End Sub

target disasm lines:
  modProbe.Sub Main | 40144F    FBEE                  FnLenBStr
