Resolving dependencies... Build profile: -w ghc-9.8.4 -O0 In order, the following will be built (use -v for more details): - event-transformer-0.1.0.0 (first run) Configuring event-transformer-0.1.0.0... Preprocessing library for event-transformer-0.1.0.0.. Building library for event-transformer-0.1.0.0.. [1 of 1] Compiling Control.Monad.Trans.Event ( src/Control/Monad/Trans/Event.hs, /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/build/Control/Monad/Trans/Event.o, /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/build/Control/Monad/Trans/Event.dyn_o ) src/Control/Monad/Trans/Event.hs:75:3: warning: [GHC-22705] [-Wnoncanonical-monad-instances] Noncanonical return definition detected in the instance declaration for Monad (EventT m). return will eventually be removed in favour of pure Suggested fix: Either remove definition for return (recommended) or define as return = pure See also: https://gitlab.haskell.org/ghc/ghc/-/wikis/proposal/monad-of-no-return | 75 | return = done | ^^^^^^^^^^^^^ Preprocessing executable 'event-transformer-exe' for event-transformer-0.1.0.0.. Building executable 'event-transformer-exe' for event-transformer-0.1.0.0.. [1 of 1] Compiling Main ( app/Main.hs, /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/build/event-transformer-exe/event-transformer-exe-tmp/Main.o ) [2 of 2] Linking /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/build/event-transformer-exe/event-transformer-exe Preprocessing test suite 'event-transformer-test' for event-transformer-0.1.0.0.. Building test suite 'event-transformer-test' for event-transformer-0.1.0.0.. [1 of 1] Compiling Main ( test/Spec.hs, /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/build/event-transformer-test/event-transformer-test-tmp/Main.o ) [2 of 2] Linking /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/build/event-transformer-test/event-transformer-test Running 1 test suites... Test suite event-transformer-test: RUNNING... Test suite event-transformer-test: PASS Test suite logged to: /var/lib/hackage-doc-builder/build-cache/tmp-install/reports/event-transformer-0.1.0.0.test Writing: hpc_index.html Writing: hpc_index_fun.html Writing: hpc_index_alt.html Writing: hpc_index_exp.html Test coverage report written to /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/hpc/vanilla/html/event-transformer-test/hpc_index.html 1 of 1 test suites (1 of 1 test cases) passed. Writing: hpc_index.html Writing: hpc_index_fun.html Writing: hpc_index_alt.html Writing: hpc_index_exp.html Package coverage report written to /var/lib/hackage-doc-builder/build-cache/tmp-install/dist-newstyle/build/x86_64-linux/ghc-9.8.4/event-transformer-0.1.0.0/noopt/hpc/vanilla/html/event-transformer-0.1.0.0/hpc_index.html