No "warning: [-Wunrecognised-pragmas] Unrecognised pragma" when there is no name of pragmas

module Qwer where

a = ({-# LANGUAGE #-})

main :: IO ()
main = print (if True then () else ())

if a = ({-# #-}) then GHC compiles with a warning\\

qwer.hs:3:6: warning: [-Wunrecognised-pragmas] Unrecognised pragma
  |
3 | a = ({-# #-})
  |      ^^^
Ok, modules loaded: Qwer.

if you write a = ({-# LANGUAGE #-}) without writing the name GHC compiles the file without specifying a warning.\\

*Qwer> :l qwer.hs
[1 of 1] Compiling Qwer             ( qwer.hs, interpreted )
Ok, modules loaded: Qwer.

GHCi, version 8.2.0.20170507

Trac metadata

Trac field	Value
Version	8.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture