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Inference and checking of context-sensitive pluggable types

Pluggable types can help find bugs such as null-pointer dereference or unwanted mutation (or they can prove the absence of such bugs). Unfortunately, pluggable types require annotations, which imposes a burden on programmers.
 We propose a framework for specifying, inferring and checking of context-sensitive pluggable types. Programmers can use the framework to plug existing context-sensitive type systems (e.g., Immutability, Ownership) as well as to build new systems.