Resolving dependencies...
Downloading happy-1.18.6...
[1 of 1] Compiling Main             ( /tmp/happy-1.18.6-9199/happy-1.18.6/Setup.lhs, /tmp/happy-1.18.6-9199/happy-1.18.6/dist/setup/Main.o )

/tmp/happy-1.18.6-9199/happy-1.18.6/Setup.lhs:12:26:
    Module `System.IO.Error' does not export `try'
Failed to install happy-1.18.6
cabal: Error: some packages failed to install:
happy-1.18.6 failed during the configure step. The exception was:
ExitFailure 1