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In programming language theory, flow-sensitive typing is a type system where the type of an expression depends on its position in the control flow.
In statically typed languages, a type of an expression is determined by the types of the sub-expressions that compose it. However, in flow-sensitive typing, an expression's type may be updated to a more specific type if it follows an operation that validates its type. Validating operations can include type predicates, imperative updates, and control flow.
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