GROOVY-8310: STC: check closure return type when method type has generic #1078
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Signature for DGM.collectMany needed to be fixed. Once STC checks closure return type compatibility (against method with return type generics), a list returned from the body of a
collectMany
will not matchClosure<Collection<? extedns T>>
but does satisfyClosure<? extends Collection<? extedns T>>
.