#13880: panic initTc: unsolved constraints -------------------------------------+------------------------------------- Reporter: vanto | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I'm trying to play with some piece of code in GHCi. Sorry if it's a duplicate bug.\\ {{{ {-# LANGUAGE TemplateHaskell #-} module Testbar where printf :: String -> String printf s = gen (parse s) $(printf "Error: %s at line %d") }}} {{{ Prelude> :l testbar [1 of 1] Compiling Testbar ( testbar.hs, interpreted ) ghc.exe: panic! (the 'impossible' happened) (GHC version 8.0.2 for i386-unknown-mingw32): initTc: unsolved constraints WC {wc_insol = [W] gen_a10Q :: t_a10P[tau:1] (CHoleCan: gen) [W] parse_a10Z :: t_a10Y[tau:1] (CHoleCan: parse)} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13880 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler