#10466: Bogus multiple-declaration error in GHCi + Template Haskell -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Try this (with ghc 7.8.3) {{{ th% ghc --version The Glorious Glasgow Haskell Compilation System, version 7.8.3 th $ ghc --interactive -XTemplateHaskell GHCi, version 7.8.3: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Prelude> let x = True Prelude> let y = [d| x = 'c' |] <interactive>:3:13: Multiple declarations of ‘x’ Declared at: <interactive>:2:5 <interactive>:3:13 In the Template Haskell quotation [d| x = 'c' |] }}} This is obviously wrong, a failure of the name-shadwing code in `RnNames.extendGlobalRdrEnvRn`. I suspect that this afflicts 7.10 too, but I can't check that right now. Working on a fix. -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10466> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler