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EPISODE · Mar 20, 2020 · 13 MIN

Noncompositionality of syntactic structural-recursion checks

from Iowa Type Theory Commute · host Aaron Stump

Review of need for termination analysis for recursive functions on inductive datatypes.  Discussion of a serious problem with syntactic termination checks, namely noncompositionality.  A function may pass the syntactic termination check, but abstracting part of it out into a helper function may result in code which no longer passes the check.  So we need a compositional termination check, which will be discussed in subsequent episodes.

Episode metadata supplied by the publisher feed · Published Mar 20, 2020

What this episode covers

Review of need for termination analysis for recursive functions on inductive datatypes. Discussion of a serious problem with syntactic termination checks, namely noncompositionality. A function may pass the syntactic termination check, but abstracting part of it out into a helper function may result in code which no longer passes the check. So we need a compositional termination check, which will be discussed in subsequent episodes.

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This episode is 13 minutes long.

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This episode was published on March 20, 2020.

What is this episode about?

Review of need for termination analysis for recursive functions on inductive datatypes.  Discussion of a serious problem with syntactic termination checks, namely noncompositionality.  A function may pass the syntactic termination check, but...

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