[1 of 4] Compiling Common           ( Common.hs, Common.o )
[2 of 4] Compiling Definitions      ( Definitions.hs, Definitions.o )
[3 of 4] Compiling EmitWantedPlugin ( EmitWantedPlugin.hs, EmitWantedPlugin.o )
[4 of 4] Compiling TcPlugin_EmitWanted ( TcPlugin_EmitWanted.hs, TcPlugin_EmitWanted.o )

TcPlugin_EmitWanted.hs:13:7: error:
    • Couldn't match type ‘Bool’ with ‘()’ arising from a use of ‘foo’
    • In the expression: foo
      In an equation for ‘bar’: bar = foo