#14843: Can't splice a partially applied PromoteTupleT type from Template Haskell -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Template | Version: 8.2.2 Haskell | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: GHC rejects Unknown/Multiple | valid program Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{#!hs {-# LANGUAGE DataKinds #-} {-# LANGUAGE TemplateHaskell #-} module Bug where import Language.Haskell.TH.Syntax type T1 = $(return (PromotedTupleT 2)) type T2 = $([t| '(,) |]) type T3 = $(return (PromotedT (tupleDataName 2))) }}} The splices for `T2` and `T3` both work. However, the splice for `T1` causes Template Haskell to have a conniption: {{{ $ /opt/ghc/8.2.2/bin/ghci Bug.hs GHCi, version 8.2.2: http://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/rgscott/.ghci [1 of 1] Compiling Bug ( Bug.hs, interpreted ) Bug.hs:7:13: error: • Malformed type PromotedTupleT 2 When splicing a TH type: '(,) • In the untyped splice: $(return (PromotedTupleT 2)) | 7 | type T1 = $(return (PromotedTupleT 2)) | ^^^^^^^^^^^^^^^^^^^^^^^^^ }}} Patch incoming. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14843 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler