GHC 8.0.1 x64 Windows installer doesn't honor custom install location
The GHC Windows installer has (thankfully!) the option for a preferred custom install location, in my case 'c:\devel\Haskell\8' (beside 'c:\devel\Haskell\WinHugs' etc.) However, it obstinately installs into 'c:\Program Files\Haskell Platform\yada yada...' The uninstaller operates with the custom location, and the uninstallation therefore fails.
Potential triggers: disallowing the installer to muck with the environment path and registry (I set these myself, thank you very much).
Workaround: GHC is thankfully still self contained, and moving the installation to the preferred location suffices.