#14760: Error reporting on obsolete file -------------------------------------+------------------------------------- Reporter: hsyl20 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Poor/confusing Unknown/Multiple | error message Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I have just had this warning: {{{ Whatever.hs:41:1: warning: [-Wunused-imports] The import of ‘Data.Map’ is redundant except perhaps to import instances from ‘Data.Map’ To import instances alone, use: import Data.Map() | 41 | import Data.Foldable | ^^^^^^^^^^^^^^^^^^^^^ }}} This happens because the source file has been modified during the compilation: GHC shows an excerpt of the new file to report an error in the old file. Could we cache the old file somehow during the compilation to avoid this discrepancy? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14760 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler