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8c8212ef12
Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
A variety of tests around reachability. These tests in general check two things:
- that we get unreachable code warnings in reasonable locations;
- that we permit coercions into
!from expressions which diverge, where an expression "diverges" if it must execute some subexpression of type!, or it has type!itself.