Incomplete acm style
Currently association-for-computing-machinery.csl generates the following bibliography from this bib:
[1] Sten Andler. 1979. Predicate Path Expressions. In Proceedings of the 6th ACM SIGACT-SIGPLAN Symposium on Principles of Programming Languages (POPL '79), ACM, New York, NY, USA, 226–236. DOI:https://doi.org/10.1145/567752.567774
Which differs to the official results with venue missing:
[1] Sten Andler. 1979. Predicate path expressions. In Proceedings of the 6th. ACM SIGACT-SIGPLAN Symposium on Principles of Programming Languages (POPL '79), January 29 - 31, 1979, San Antonio, Texas. ACM, New York, NY, 226-236. https://doi.org/10.1145/567752.567774
This commits changes the result to:
[1] Sten Andler. 1979. Predicate Path Expressions. In Proceedings of the 6th ACM SIGACT-SIGPLAN Symposium on Principles of Programming Languages (POPL '79), 1979, San Antonio, Texas. ACM, New York, NY, USA, 226–236. https://doi.org/10.1145/567752.567774
The “January 29 - 31, 1979” appears to be a event-title rather than issued. I suggest trying to use event-date first and it falls back to issued. In addition, the numeric-leading-zeros is unnecessary and the range-delimiter should be -.