摘要: This volume contains the papers presented at the 21st Symposium on Practical Aspects of Declarative Languages (PADL 2019), held during January 14-15, 2019, in Lisbon, Portugal. The symposium was co-located with the 46th ACM SIGPLA... 展开 This volume contains the papers presented at the 21st Symposium on Practical Aspects of Declarative Languages (PADL 2019), held during January 14-15, 2019, in Lisbon, Portugal. The symposium was co-located with the 46th ACM SIGPLAN Symposium on Principles of Programming Languages (POPL 2019). PADL is a well-established forum for researchers and practitioners to present original work emphasizing novel applications and implementation techniques for all forms of declarative concepts, including, but not limited to, logic, constraint, and functional languages. 收起