[PATCH v4 0/1] MR10366: vbscript: Fix For loop getting stuck when expression evaluation fails with On Error Resume Next.

[Francis De Brabandere (＠francisdb)]

When a For..To loop's bound expression fails (e.g. UBound on Empty) and
On Error Resume Next is active, the error handler fills the step/to stack
slots with VT_EMPTY. On the next iteration, VarCmp fails on these values
and the error propagates back into the loop, causing an infinite loop.

Fix this by handling VarCmp failures in interp_step: exit the loop and
report error 92 (For loop not initialized). Also make interp_incc ignore
VarAdd failures so execution reaches interp_step for proper cleanup.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54291

--
  v4: vbscript: Fix For loop getting stuck when expression evaluation fails with On Error Resume Next.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10366