Fix more corner cases in late expansion #179
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e.g `val x2 = Foo[$1] with Bar = boundValue` is rewritten to `val x2 = (Foo[$1] @uncheckedBounds) with Bar = boundValue` This is to have refchecks turn a blind eye to the type argument that doesn't conform the to type parameter bounds. For regular compilation, without the async transform between patmat and refchecks, bound conformance is disabled with: https://github.com/scala/scala/blob/v2.11.7/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala#L1743 Using the `uncheckedBounds` annotation is a newer, more inclusive way of acheiving the same thing: https://github.com/scala/scala/blob/v2.11.7/src/compiler/scala/tools/nsc/typechecker/RefChecks.scala#L1677
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