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Merge pull request #385 from kenichi-asai/inference

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Inference: a variable -> an abstraction
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Philip Wadler 2019-10-21 16:13:09 +01:00 • committed by GitHub
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src/plfa/part2/Inference.lagda.md
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@ -169,7 +169,7 @@ checks that the inherited and synthesised types match.
Similarly, we said above that the function of an application is typed
by synthesis and that abstractions are typed by inheritance, giving a
mismatch if the function of an application is a variable. Hence, we
mismatch if the function of an application is an abstraction. Hence, we
need a way to treat an inherited term as if it is synthesised. We
introduce a new term form `M ↓ A` for this purpose. The typing
judgment returns `A` as the synthesized type of the term as a whole,