Pseudo code:


redirect STDERR to $outerbuffer in the classic way of perlopentut
call inner module:
    print STDERR "INNER BEFORE CAPTURE" # go to $outerbuffer
    redirect STDERR to $innerbuffer in the classic way of perlopentut
    call code which reports errors on STDERR eg: "FIRST CAPTURE" 
    #  above output goes to $innerbuffer 
    restore STDERR of $innerbuffer in the classic way of perlopentut
    # From here on printing to STDERR should go to $outerbuffer again 
    # But it does not. 
    code handling $innerbuffer ... 
    print STDERR "inner past restore"  # should go to $outerbuffer (is missing)
print STDERR "outer past call" # should go to $outerbuffer (is missing)
restore STDERR of $outerbuffer in the classic way of perlopentut
# From here on STDERR goes to the standard file handle (fd=2)



#handleOuter() is expected to produce:
####################
#handleOuter() is expected to produce:
OUTER BEFORE CAPTURE
INNER BEFORE CAPTURE
INNER AFTER RESTORE
BUFFER (inner): >>FIRST CAPTURE<<
OUTER AFTER RESTORE
BUFFER (outer):
>>OUTER BEFORE CALL\ninner past restore\nouter past call<<

INNER BEFORE CAPTURE
INNER AFTER RESTORE
BUFFER (inner): 
#>>FIRST CAPTURE<<
OUTER AFTER RESTORE
BUFFER (outer): 
#>>INNER BEFORE CAPTURE\ninner past restore<<