t3453.scala:18: error: type mismatch;
found : A
required: B
new A
^
t3453.scala:36: error: type mismatch;
found : A
required: B
new A
^
t3453.scala:50: error: type mismatch;
found : A
required: B
new A
^
t3453.scala:64: error: type mismatch;
found : A
required: B
new A
^
four errors found