<mathematics, logic> (TLC) A variety of lambda-calculus in which every term is labelled with a type.
A function application (A B) is only syntactically valid if A has type s --> t, where the type of B is s (or an instance or s in a polymorphic language) and t is any type.
If the types allowed for terms are restricted, e.g. to Hindley-Milner types then no term may be applied to itself, thus avoiding one kind of non-terminating evaluation.
Most functional programming languages, e.g. Haskell, ML, are closely based on variants of the typed lambda-calculus.
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