#13254: Confusing error message from GHCI - "defined in multiple files" shows the same file -------------------------------------+------------------------------------- Reporter: ocharles | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I just had the following very confusing exchange with GHCI: {{{ λ :load Ok, modules loaded: none. λ :load src/Application/Aws.hs Ok, modules loaded: Application.Aws (dist/build/Application/Aws.o). λ private <interactive>:3:1: error: Variable not in scope: private λ :m *Application.Aws module 'Application.Aws' is not interpreted; try ':add *Application.Aws' first λ :add *Application.Aws <no location info>: error: module ‘circuithub-api-0.0.4-EeGo4QUTODrB58BZrr3htj:Application.Aws’ is defined in multiple files: src/Application/Aws.hs src/Application/Aws.hs Failed, modules loaded: Application.Aws (dist/build/Application/Aws.o). λ :! ghc --version The Glorious Glasgow Haskell Compilation System, version 8.1.20161115 }}} This can really be simplified to {{{ λ :load src/Application/Aws.hs Ok, modules loaded: Application.Aws (dist/build/Application/Aws.o). λ :add *Application.Aws <no location info>: error: module ‘circuithub-api-0.0.4-EeGo4QUTODrB58BZrr3htj:Application.Aws’ is defined in multiple files: src/Application/Aws.hs src/Application/Aws.hs Failed, modules loaded: Application.Aws (dist/build/Application/Aws.o). }}} For the record, here is Application.Aws: {{{#!hs {-# LANGUAGE DeriveDataTypeable #-} module Application.Aws ( AwsExtra(..) ) where import Prelude import Data.Data (Data) import Data.ByteString.Char8 import Data.Text data AwsExtra = AwsExtra { awsKey :: ByteString , awsSecret :: ByteString , awsS3AssetsBucket :: Text } deriving (Show,Data) private :: Int private = 42 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13254 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler