Overview: This book constitutes the refereed proceedings of the 21st Asian Symposium?on?Programming Languages and Systems, APLAS 2023, held in Taipei, Taiwan,?during?November 26–29, 2023..The 15 full papers included in this book are carefully reviewed and?selected from?32?submissions. They were organized in topical sections as follows: semantics, logics, and foundational theory; design of languages, type systems, and foundational calculi; domain-specific languages; compilers, interpreters, and abstract machines; program derivation, synthesis, and transformation; program analysis, verification,
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