[M3devel] use of uninitialized local in PaintVBTtoVBT??

[Jay K]

Can anyone explain this?

DblBufferVBT.m3

PROCEDURE PaintVBTtoVBT(to: VBT.T; clip: Rect.T;
  from: VBT.T; delta := Point.Origin; wait := TRUE) =
<* LL.sup < to *>
  VAR dummy: Region.T; pixmap: ScrnPixmap.T; BEGIN
    pixmap := VBT.Capture(from, Rect.Sub(clip, delta), (*OUT*) dummy);
 
VBT.m3:

PROCEDURE Capture (v: T; READONLY clip: Rect.T; VAR (*out*) br: Region.T):
  ScrnPixmap.T RAISES {} =
  VAR bad: Region.T;
  BEGIN
    LOCK v DO

from is passed uninitialized to Capture.
The code appears the same in head, 5.2.6, 3.6.
I do hit the LOCK v in Capture if I run Juno sufficient times on NT.
Maybe from should be Child() or ch?
I'll try that.
 
 
 - Jay