Revert "Make scanr a good producer and consumer"

This reverts commit 4e1dfc37.

Due to #16943.

(cherry picked from commit bbdd2c96)
18 jobs for !1538 with wip/backports in 322 minutes and 47 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Lint
passed #138073
lint
ghc-linters

00:00:15

passed #138074
lint
lint-submods-mr

00:00:15

 
  Build
failed #138077
x86_64-linux allowed to fail
release-x86_64-linux-deb9-dwarf

01:14:47

passed #138075
x86_64-linux
validate-x86_64-linux-deb8-hadrian

02:48:51

passed #138076
x86_64-linux
validate-x86_64-linux-deb9-debug

01:10:34

 
  Full Build
failed #138079
aarch64-linux allowed to fail
validate-aarch64-linux-deb9

01:00:23

passed #138080
x86_64-linux
validate-i386-linux-deb9

01:27:06

passed #138078
x86_64-darwin
validate-x86_64-darwin

01:31:45

passed #138081
x86_64-linux
validate-x86_64-linux-deb9

01:43:48

failed #138083
x86_64-linux allowed to fail
validate-x86_64-linux-deb9-integer-simple

00:39:54

failed #138082
x86_64-linux allowed to fail
validate-x86_64-linux-deb9-llvm

00:01:30

passed #138084
x86_64-linux
validate-x86_64-linux-deb9-unreg

02:14:03

passed #138085
x86_64-linux
validate-x86_64-linux-fedora27

01:26:16

failed #138087
x86_64-windows allowed to fail
validate-x86_64-windows

02:32:24

failed #138086
x86_64-windows allowed to fail
validate-x86_64-windows-hadrian

00:28:59

 
  Cleanup
passed #138089
x86_64-darwin
cleanup-darwin

00:00:08

passed #138088
x86_64-windows
cleanup-windows

00:01:05

 
  Hackage
manual #138090
x86_64-linux allowed to fail manual
hackage
 
Name Stage Failure
failed
validate-aarch64-linux-deb9 Full Build
$ cp -Rf $HOME/.cabal cabal-cache
Uploading artifacts...
WARNING: ghc-*.tar.xz: no matching files
WARNING: junit.xml: no matching files
ERROR: No files to upload
Uploading artifacts...
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1
failed
validate-x86_64-linux-deb9-llvm Full Build There has been a runner system failure, please try again
Running with gitlab-runner 11.10.1 (1f513601)
on ghc-ci-gce-x86_64-1 4vD1x1BB
Using Docker executor with image registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb9:cefaee3c742af193e0f7783f87edb0d35374515c ...
Pulling docker image registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb9:cefaee3c742af193e0f7783f87edb0d35374515c ...
Using docker image sha256:08448832520723b87529cd5d93fad9dcd02b4a19500889ea9dc245225cc44c4e for registry.gitlab.haskell.org/ghc/ci-images/x86_64-linux-deb9:cefaee3c742af193e0f7783f87edb0d35374515c ...
ERROR: Job failed (system failure): Error response from daemon: No such container: 5bca28e2f155ec98a19ba69df4cd6df51655e6ef2eab6bcfb27bf3c9cd938b3f (executor_docker.go:933:0s)
failed
validate-x86_64-windows-hadrian Full Build
   Speed :            94731022 Bytes/sec.
Speed : 5420.552 MegaBytes/min.
Ended : Tuesday, August 6, 2019 6:45:04 PM

Uploading artifacts...
Runtime platform arch=amd64 os=windows pid=4088 revision=1f513601 version=11.10.1
WARNING: ghc.tar.xz: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
failed
release-x86_64-linux-deb9-dwarf Build
$ cp -Rf $HOME/.cabal cabal-cache
Uploading artifacts...
ghc-*.tar.xz: found 1 matching files
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=138077 responseStatus=201 Created token=VMxygLzy
Uploading artifacts...
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=138077 responseStatus=201 Created token=VMxygLzy
ERROR: Job failed: exit code 1
failed
validate-x86_64-linux-deb9-integer-simple Full Build
make[1]: *** Waiting for unfinished jobs....
Makefile:123: recipe for target 'all' failed
make: *** [all] Error 2
Running after script...
$ cp -Rf $HOME/.cabal cabal-cache
Uploading artifacts...
WARNING: junit.xml: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1
failed
validate-x86_64-windows Full Build
junit.xml: found 1 matching files                  
WARNING: Failed to load system CertPool:crypto/x509: system root pool is not available on Windows
Uploading artifacts to coordinator... ok
id=138087 responseStatus=201 Created token=ExZA75W4
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=2668 revision=1f513601 version=11.10.1
junit.xml: found 1 matching files

WARNING: Failed to load system CertPool:crypto/x509: system root pool is not available on Windows
Uploading artifacts to coordinator... ok
id=138087 responseStatus=201 Created token=ExZA75W4
ERROR: Job failed: exit status 2