#13880: panic initTc: unsolved constraints -------------------------------------+------------------------------------- Reporter: vanto | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.0.2 Resolution: duplicate | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: #13106 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => duplicate * related: => #13106 * milestone: => 8.2.1 @@ -4,1 +4,1 @@ - {{{ + {{{#!hs New description: I'm trying to play with some piece of code in GHCi. Sorry if it's a duplicate bug.\\ {{{#!hs {-# 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 }}} -- Comment: I believe this is a duplicate of #13106. I get a reasonable error with 8.2. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13880#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler