object RequireBlocking extends WartTraverser
All blocking method calls should be wrapped in scala.concurrent.blocking so that the execution context knows that it may have to spawn a new process.
This wart checks that all @{code synchronized} calls are surrounded immediately by a scala.concurrent.blocking call.
It also complains about calls to java.lang.Thread.sleep as Threading.sleep should be used instead.
The logic can currently be fooled by renaming synchronized and sleep.
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