Cabal release for GHC 8.4

[bgamari]

GHC 8.4 is quickly approaching. What is the status here?

[phadej]

I need to fix a bug in #5055, will do that tomorrow.

[23Skidoo]

I'll create a branch once that is merged.

[angerman]

We need #4874 for hadrian (reloc).

[angerman]

There should be no release before #5053 is merged.

[phadej]

• Rename all-packages to package * #5053 is cabal-install change, so it's not a blocker for Cabal branch.
• basedir #4874 has Cabal changes, so we have to get that in too.

[phadej]

@bgamari is https://ghc.haskell.org/trac/ghc/wiki/Commentary/Libraries/VersionHistory correct, time will stay at 1.8.0.2. @hvr when parsec-3.1.12 will be released? (Do we want to have >=3.1.12 lower bound?)

[Ericson2314]

Hoping to land #4383, so we will only have 2.0 allowing ambiguous libraries

[phadej]

AFAICS everything is in, can we cut the 2.2 branch?

[angerman]

#4874

[phadej]

@angerman hopefully it will be merged by the time @23Skidoo notices my message! :)

[angerman]

Yea, I'm running some final hadrian tests, and will fix #5111 for inclusion (which unbreaks #4892, which broken when trying to get the flags to hide... for some reason my cross validation ran against some stale code :( -- it's now only blocked by the use of LambdaCase, I believe; will fix.)