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It appears that a change in Cabal 3.12 has caused the dummy Lexer.hs file to no longer be shadowed by the one produced from Lexer.x which causes compilation to fail with
cabal-3.12 install fast-tags
Moreover, it no longer seems necessary, since
cabal repl
successfully loads the project even when Lexer.hs does not exist in the source (only Lexer.x does)The simple solution seems to simply delete this hacky Lexer.hs file from the source.