Report the loss of trait init methods #448
Merged
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In the encoding of traits the presence of a method with a body (a
"concrete method") triggers the generation of a trait initialisation
method, "$init$", which will be invoked by subclasses during
construction. The effect this has is that dropping the last concrete
method(s) from a trait removes the trait init method, which is a
binary incompatible change to client's subclasses.
Fixes #426