Hello, All, I want to switch to the new GHC (8.2.2) because I hit some bug in GHC and suppose that it may be fixed in the new version. So, to try it I changed "resolver: XXX" in my .yaml-files to "lts-9.18". Also I done something else (I don't remember what exactly) and call `stack setup ... --reinstall ...`. New GHC have been installed. And I switched to new LTS - I see it 100%. But when I run `stack build`, IMHO compiller is old, because if I call `stack ghci` I see that old GHC (8.0.2) is calling. I'm not familiar with stack/Haskell tools in-depth and may miss something! For example, I know that LTS-9.18 is last stable, GHC 8.2.2 is last too, but in Stackage seems that 9.18 corresponds to 8.2.2. If I run `stack setup` in the directory with my project again I get: --cut-- stack will use a sandboxed GHC it installed For more information on paths, see 'stack path' and 'stack exec env' To use this GHC and packages outside of a project, consider using: stack ghc, stack ghci, stack runghc, or stack exec --cut-- Would somebody explain me what is wrong here and how I can test a project with new 8.2.2 GHC? === Best regards, Paul