Type-checker plugins aren't loaded in GHCi 8.6.1

Type-Checker plugins seem to work in GHCi-8.4.3 https://gist.github.com/phadej/f2040eba327a88d3652cda021403f97f

However with GHC-8.6.1

The Glorious Glasgow Haskell Compilation System, version 8.6.0.20180907 76a23314 (which seems to be the last commit in 8.6 branch atm)

the plugins aren't loaded.

% ghci-8.6.1 -fplugin=ThereIsNoPlugin
GHCi, version 8.6.0.20180907: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/ogre/.ghci
λ> 

starts a session without a warning. 8.4.3 however fails:

% ghci-8.4.3 -fplugin=ThereIsNoPlugin
GHCi, version 8.4.3: http://www.haskell.org/ghc/  :? for help
<command line>: Could not find module ‘ThereIsNoPlugin’

Trac metadata

Trac field	Value
Version	8.6.1-beta1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture