GHCJS Execute.hs: Non-exhaustive patterns in lambda

[k-bx]

I recently added stack support to reflex-todomvc. If you clone the ghcjs-improved-base -- you can build it. It's on lts-3.13 snapshot.

But! If you change snapshot to 3.20 -- here's what you'll get:

➜  reflex-todomvc git:(ghcjs-improved-base) ✗ stack build -v
Version 1.0.0 x86_64
2016-01-02 23:03:04.142485: [debug] Checking for project config at: /Users/kb/workspace/reflex-todomvc/stack.yaml @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Config src/Stack/Config.hs:577:9)
2016-01-02 23:03:04.145674: [debug] Loading project config file stack.yaml @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Config src/Stack/Config.hs:600:13)
2016-01-02 23:03:04.146892: [debug] Trying to decode /Users/kb/.stack/indices/Hackage/00-index.cache @(stack_K1kniaHYGIIAOnuRhqejxt:Data.Binary.VersionTagged src/Data/Binary/Version
Tagged.hs:55:5)
2016-01-02 23:03:04.425278: [debug] Success decoding /Users/kb/.stack/indices/Hackage/00-index.cache @(stack_K1kniaHYGIIAOnuRhqejxt:Data.Binary.VersionTagged src/Data/Binary/Version
Tagged.hs:64:13)
2016-01-02 23:03:04.485275: [debug] Run process: ghcjs  @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:04.562404: [debug] Run process: ghcjs --version @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:04.589867: [debug] Run process: ghcjs-pkg --no-user-package-db field --simple-output Cabal version @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Pro
cess/Read.hs:267:3)
2016-01-02 23:03:04.621317: [debug] Run process: ghcjs-pkg --no-user-package-db list --global @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:04.653835: [debug] Checking resolver: lts-3.20 @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Build.Source src/Stack/Build/Source.hs:164:17)
2016-01-02 23:03:04.653971: [debug] Trying to decode /Users/kb/.stack/build-plan-cache/x86_64-osx/lts-3.20.cache @(stack_K1kniaHYGIIAOnuRhqejxt:Data.Binary.VersionTagged src/Data/Bi
nary/VersionTagged.hs:55:5)
2016-01-02 23:03:04.661730: [debug] Success decoding /Users/kb/.stack/build-plan-cache/x86_64-osx/lts-3.20.cache @(stack_K1kniaHYGIIAOnuRhqejxt:Data.Binary.VersionTagged src/Data/Bi
nary/VersionTagged.hs:64:13)
2016-01-02 23:03:04.727882: [debug] Run process: ghcjs-pkg --global --no-user-package-db dump --expand-pkgroot @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/
Read.hs:267:3)
2016-01-02 23:03:04.766371: [warn] Ignoring that the GHCJS boot package "aeson" has a different version, 0.9.0.1, than the resolver's wanted version, 0.8.0.2 @(stack_K1kniaHYGIIAOnu
Rhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.766789: [warn] Ignoring that the GHCJS boot package "attoparsec" has a different version, 0.13.0.1, than the resolver's wanted version, 0.12.1.6 @(stack_K1kniaHY
GIIAOnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.766902: [warn] Ignoring that the GHCJS boot package "scientific" has a different version, 0.3.3.8, than the resolver's wanted version, 0.3.4.4 @(stack_K1kniaHYGI
IAOnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.766986: [warn] Ignoring that the GHCJS boot package "case-insensitive" has a different version, 1.2.0.4, than the resolver's wanted version, 1.2.0.5 @(stack_K1kn
iaHYGIIAOnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.767217: [warn] Ignoring that the GHCJS boot package "hashable" has a different version, 1.2.3.2, than the resolver's wanted version, 1.2.3.3 @(stack_K1kniaHYGIIA
OnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.767562: [warn] Ignoring that the GHCJS boot package "async" has a different version, 2.0.1.6, than the resolver's wanted version, 2.0.2 @(stack_K1kniaHYGIIAOnuRh
qejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.767680: [warn] Ignoring that the GHCJS boot package "vector" has a different version, 0.11.0.0, than the resolver's wanted version, 0.10.12.3 @(stack_K1kniaHYGII
AOnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.767793: [warn] Ignoring that the GHCJS boot package "text" has a different version, 1.2.1.1, than the resolver's wanted version, 1.2.2.0 @(stack_K1kniaHYGIIAOnuR
hqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.767991: [warn] Ignoring that the GHCJS boot package "stm" has a different version, 2.4.4, than the resolver's wanted version, 2.4.4.1 @(stack_K1kniaHYGIIAOnuRhqe
jxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.768174: [warn] Ignoring that the GHCJS boot package "dlist" has a different version, 0.7.1.1, than the resolver's wanted version, 0.7.1.2 @(stack_K1kniaHYGIIAOnu
Rhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.768250: [debug] Ignoring package Cabal due to wanting version 1.22.6.0 instead of 1.22.4.0 @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Build.Installed src/Stack/Build/I
nstalled.hs:189:5)
2016-01-02 23:03:04.768391: [warn] Ignoring that the GHCJS boot package "pretty" has a different version, 1.1.3.2, than the resolver's wanted version, 1.1.2.0 @(stack_K1kniaHYGIIAOn
uRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.768457: [warn] Ignoring that the GHCJS boot package "containers" has a different version, 0.5.6.3, than the resolver's wanted version, 0.5.6.2 @(stack_K1kniaHYGI
IAOnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.778165: [warn] Ignoring that the GHCJS boot package "transformers" has a different version, 0.4.3.0, than the resolver's wanted version, 0.4.2.0 @(stack_K1kniaHY
GIIAOnuRhqejxt:Stack.Build.Installed src/Stack/Build/Installed.hs:179:9)
2016-01-02 23:03:04.778602: [debug] Run process: ghcjs-pkg --user --no-user-package-db --package-db /Users/kb/.stack/snapshots/x86_64-osx/lts-3.20/ghcjs-0.2.0.20151029_ghc-7.10.2/pk
gdb dump --expand-pkgroot @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:04.803828: [debug] Run process: ghcjs-pkg --user --no-user-package-db --package-db /Users/kb/workspace/reflex-todomvc/.stack-work/install/x86_64-osx/lts-3.20/ghcjs-
0.2.0.20151029_ghc-7.10.2/pkgdb dump --expand-pkgroot @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:04.863719: [debug] Trying to decode /Users/kb/.stack/indices/Hackage/00-index.cache @(stack_K1kniaHYGIIAOnuRhqejxt:Data.Binary.VersionTagged src/Data/Binary/Version
Tagged.hs:55:5)
2016-01-02 23:03:05.202913: [debug] Success decoding /Users/kb/.stack/indices/Hackage/00-index.cache @(stack_K1kniaHYGIIAOnuRhqejxt:Data.Binary.VersionTagged src/Data/Binary/Version
Tagged.hs:64:13)
2016-01-02 23:03:05.722922: [debug] Run process: ghcjs-pkg --no-user-package-db list --global @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:05.746994: [info] dependent-sum-0.2.1.0: copying precompiled package @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Build.Execute src/Stack/Build/Execute.hs:668:23)
2016-01-02 23:03:05.748080: [info] file-embed-0.0.9: copying precompiled package @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Build.Execute src/Stack/Build/Execute.hs:668:23)
2016-01-02 23:03:05.748274: [info] data-default-class-0.0.1: copying precompiled package @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Build.Execute src/Stack/Build/Execute.hs:668:23)
2016-01-02 23:03:05.748535: [debug] Run process: ghc-pkg unregister --force dependent-sum-0.2.1.0 @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3
)
2016-01-02 23:03:05.788197: [info] nats-1: copying precompiled package @(stack_K1kniaHYGIIAOnuRhqejxt:Stack.Build.Execute src/Stack/Build/Execute.hs:668:23)
2016-01-02 23:03:05.788639: [debug] Run process: ghc-pkg unregister --force file-embed-0.0.9 @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
2016-01-02 23:03:05.826937: [debug] Run process: ghc-pkg unregister --force data-default-class-0.0.1 @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:26
7:3)
2016-01-02 23:03:05.866088: [debug] Run process: ghc-pkg unregister --force nats-1 @(stack_K1kniaHYGIIAOnuRhqejxt:System.Process.Read src/System/Process/Read.hs:267:3)
Progress: 4/44src/Stack/Build/Execute.hs:999:22-65: Non-exhaustive patterns in lambda


src/Stack/Build/Execute.hs:999:22-65: Non-exhaustive patterns in lambda


src/Stack/Build/Execute.hs:999:22-65: Non-exhaustive patterns in lambda


src/Stack/Build/Execute.hs:999:22-65: Non-exhaustive patterns in lambda

[k-bx]

➜  reflex-todomvc git:(ghcjs-improved-base) ✗ stack --version
Version 1.0.0 x86_64

[k-bx]

Sorry, the problem was that ghc-pkg wasn't in my PATH. I mean, this is still a stack issue as well (since it'd work for globally-installed ghc), but I guess it's so minor that we can skip it for now?

[mgsloan]

Thanks for reporting this! I've fixed the issue and enabled some warnings not included in -Wall. In particular, this is caught by -fwarn-incomplete-uni-patterns.

[k-bx]

👍 thank you!