is a variable defined in `
Its value is
- This variable may be risky if used as a file-local variable.
Special hook called to skip special frames in `called-interactively-p'.
The functions are called with 3 arguments: (I FRAME1 FRAME2),
where FRAME1 is a "current frame", FRAME2 is the next frame,
I is the index of the frame after FRAME2. It should return nil
if those frames don't seem special and otherwise, it should return
the number of frames to skip (minus 1).