This book constitutes the refereed proceedings of the 12th Asian Symposium on Programming Languages and Systems, APLAS 2014, held in Singapore, Singapore in November 2014. The 20 regular papers presented together with the abstracts of 3 invited talks were carefully reviewed and selected from 57 submissions. The papers cover a variety of foundational and practical issues in programming languages and systems - ranging from foundational to practical issues. The papers focus on topics such as semantics, logics, foundational theory; design of languages, type systems and foundational calculi; domain-specific languages; compilers, interpreters, abstract machines; program derivation, synthesis and transformation; program analysis, verification, model-checking; logic, constraint, probabilistic and quantum programming; software security; concurrency and parallelism; as well as tools and environments for programming and implementation.

This volume contains the proceedings of the 9th International Symposium on Functional and Logic Programming (FLOPS 2008), held in Ise, Japan, April 14-16, 2008 at the Ise City Plaza. FLOPS is a forum for research on all issues concerning functional progr- ming and logic programming. In particular it aims to stimulate the cro- fertilization as well as integration of the two paradigms. The previous FLOPS meetings took place in Fuji-Susono (1995), Shonan (1996), Kyoto (1998), Tsukuba(1999), Tokyo(2001), Aizu (2002), Nara(2004), and againFuji-Susono (2006). Since its 1999 edition, FLOPS proceedings have been published by Springer in itsLecture Notes in Computer Science series, as volumes 1722,2024, 2441, 2998 and 3945, respectively. In response to the call for papers, 59 papers were submitted. Each paper was reviewedbyatleastthreeProgramCommittee members, withthe helpofexpert external reviewers. The Program Committee meeting was conducted electro- cally, for a period of two weeks in December 2007. After careful and thorough discussion, the ProgramCommittee selected20 papers(33%)for presentationat theconference.Inadditiontothe20contributedpapers, thesymposiumincluded talks by three invited speakers: Peter Dybjer (Chalmers University of Techn- ogy), Naoki Kobayashi (Tohoku University) and Torsten Schaub (University of P

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