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
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tbug TemplateHaskell Trac import labels

Trac metadata

Trac field	Value
Differential revisions	- → D4442

mentioned in commit 68357020

closed

changed milestone to %8.6.1

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed
Test case	- → T14843

added Pnormal label