base: Drop out-of-date comment

The comment in GHC.Base claimed that ($) couldn't be used in that module
as it was wired-in. However, this is no longer true; ($) is merely known
key and is defined in Haskell (with a RuntimeRep-polymorphic type) in
GHC.Base.

The one piece of magic that ($) retains is that it a special typing
rule to allow type inference with higher-rank types
(e.g. `runST $ blah`; see Note [Typing rule for ($)] in TcExpr).
22 jobs for master in 551 minutes and 24 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Lint
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lint-linters

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  Build
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  Full Build
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validate-aarch64-linux-deb9

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armv7-linux
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x86_64-linux
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x86_64-darwin
validate-x86_64-darwin

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validate-x86_64-windows

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hackage
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Name Stage Failure
failed
pages Deploy
$ git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git refs/notes/perf:refs/notes/perf || true
warning: no common commits
From https://gitlab.haskell.org/ghc/ghc-performance-notes
* [new ref] refs/notes/perf -> refs/notes/perf
$ mkdir -p public/doc
$ tar -xf haddock.html.tar.xz -C public/doc
tar: haddock.html.tar.xz: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now
ERROR: Job failed: exit code 1
failed
validate-x86_64-windows Full Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
validate-x86_64-windows-hadrian Full Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
validate-aarch64-linux-deb9 Full Build
Uploading artifacts...
ghc-aarch64-linux-deb9.tar.xz: found 1 matching files
junit.xml: found 1 matching files

performance-metrics.tsv: found 1 matching files

Uploading artifacts to coordinator... ok
id=257330 responseStatus=201 Created token=b_4b41fo
Uploading artifacts...
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=257330 responseStatus=201 Created token=b_4b41fo
ERROR: Job failed: exit code 1
failed
doc-tarball Packaging
Synchronizing submodule url for 'utils/hsc2hs'
$ git submodule update --init --recursive
$ git checkout .gitmodules
$ git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git refs/notes/perf:refs/notes/perf || true
From https://gitlab.haskell.org/ghc/ghc-performance-notes
e7d0f5e684..6cb17942c6 refs/notes/perf -> refs/notes/perf
$ if [ ! -f "$LINUX_BINDIST" ]; then # collapsed multi-line command
Error: ghc-x86_64-mingw32.tar.xz does not exist. Did the 64-bit Windows job fail?
ERROR: Job failed: exit code 1