quad-ET should always reflect the error that caused the top suspension on the SI. When the SI is empty, quad-ET should yield 0 0.
⎕et
0 0
foo
VALUE ERROR
foo
^
⎕et
3 1
1÷0
DOMAIN ERROR
1÷0
^^
⎕et
5 4
→
⎕et
5 4
^^ NOTE: should be 3 1
→
⎕et
5 4
^^ NOTE: should be 0 0
)si
