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Re:Comparing the Same Project in Rust, Haskell, C++, Python,... by orbifold on Sunday June 16, 2019 @05:39AM (#20194693)
That's a total stretch, lens is not used in GHC for example and lots of other smaller compilers written in Haskell. It is used in Ermine but that is stuck in a semi complete state for a while now and Ekmett has moved on.
Re:Comparing the Same Project in Rust, Haskell, C++, Python,... by runeks on Sunday June 16, 2019 @06:46AM (#20194870)
I second this.

I’ve written tens of thousands of lines of Haskell, and I’ve never used lens. Also, putting it in the same category as text and vector doesn’t make sense — these are indeed unavoidable, and practically all my projects use them.

Re:Comparing the Same Project in Rust, Haskell, C++, Python,... by smichael on Monday June 17, 2019 @01:32PM (#20205341)
Thirded. No lens in pandoc (50k lines of haskell), darcs (40k), most hledger packages (15k).