Note that priority-queue is a pretty old package last uploaded in 2010 without very strict version bounds, so it is understandable that it doesn't compile anymore. I expect that fixing it would not be much work, but I think you will be better off using another priority queue package. Going by number of downloads psqueues and pqueue seem like good libraries. On 22-05-2021 20:24, David Banas wrote:

Has anyone else bumped into this compilation error when trying to use Data.PriorityQueue?

Building library for priority-queue-0.2.1.. [1 of 1] Compiling Data.PriorityQueue ( src/Data/PriorityQueue.hs, dist/build/Data/PriorityQueue.o )

src/Data/PriorityQueue.hs:120:50-54: error: Ambiguous occurrence ‘unzip’ It could refer to either ‘List.unzip’, imported from ‘Data.List’ at src/Data/PriorityQueue.hs:55:1-24 (and originally defined in ‘GHC.List’) or ‘Seq.unzip’, imported from ‘Data.Sequence’ at src/Data/PriorityQueue.hs:54:1-27 (and originally defined in ‘Data.Sequence.Internal’) | 120 | batches = map ((head *** fromList) . unzip) grouped | ^^^^^ cabal: Failed to build priority-queue-0.2.1 (which is required by exe:ex1 from haskarch-0.1.0.0). See the build log above for details.

-db

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