Can't splice a partially applied PromoteTupleT type from Template Haskell

{-# 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.

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Template Haskell
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