x(0),=userError1
y(1),=messagestring
z(2),=raise("userError1","messagestring")
a(1),=aaa
y(2),=aaa
z(3),=raise("userError2",$a)
a(1),=bbb
y(2),=bbb
z(3),=raise("userError2",$a)
a(1),=ccc
y(2),=ccc
z(3),=raise("userError2",$a)
a(1),=aaa
y(2),=aaa
z(3),=raise("userError2",$a)
userError2:ddd At raise("userError2",$c)
