Fay can't find fay-base - haskell

Question

I want to use Fay with Yesod, but can't get Fay typechecking to work.
Will appreciate any advice.
$ stack build
[ 9 of 11] Compiling Handler.Home ( src/Handler/Home.hs, .stack-work/dist/x86_64-linux-dkda49f7ca9b244180d3cfb1987cbc9743/Cabal-2.4.0.1/build/Handler/Home.o )
/home/user/code/myproject/src/Handler/Home.hs:121:13: error:
_ Exception when trying to run compile-time code:
ghc-pkg describe error:
Timestamp 2019-05-07 18:46:44 UTC for /opt/ghc/8.6.5/lib/ghc-8.6.5/package.conf.d/package.cache
ghc-pkg: cannot find package fay-base <- ########### Why?
GHC package manager version 8.6.5
using cache: /opt/ghc/8.6.5/lib/ghc-8.6.5/package.conf.d/package.cache
db stack: ["/opt/ghc/8.6.5/lib/ghc-8.6.5/package.conf.d"]
flag db stack: ["/opt/ghc/8.6.5/lib/ghc-8.6.5/package.conf.d"]
CallStack (from HasCallStack):
error, called at src/Fay/Compiler/Packages.hs:70:24 in fay-0.24.0.3-CdLcUWVJEOpLCiYHkNVTai:Fay.Compiler.Packages
Code: fayFile' (ConE 'StaticR) "HelloWorld"
_ In the untyped splice: $(fayFile' (ConE 'StaticR) "HelloWorld")
|
121 | $( fayFile' (ConE 'StaticR) "HelloWorld" )
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Fay packages are not yet in stackage, so I added them to stack.yaml as extra-deps:
extra-deps: - fay-0.24.0.3
- fay-base-0.21.1.1
- fay-dom-0.5.0.1
- fay-text-0.3.2.2
- yesod-fay-0.10.0
and to package.yaml as dependencies:
dependencies:
... more dependencies ...
- fay == 0.24.0.3
- fay-base == 0.21.1.1
- fay-dom == 0.5.0.1
- fay-text == 0.3.2.2
- yesod-fay == 0.10.0
Fay packages are in the local package database:
$ stack exec -- ghc-pkg list
/opt/ghc/8.6.5/lib/ghc-8.6.5/package.conf.d
Cabal-2.4.0.1
array-0.5.3.0
base-4.12.0.0
...
/home/user/.stack/snapshots/x86_64-linux-dkda49f7ca9b244180d3cfb1987cbc9743/lts-13.30/8.6.5/pkgdb
Cabal-2.4.1.0
Diff-0.3.4
HUnit-1.6.0.0
...
yesod-1.6.0
yesod-core-1.6.14
yesod-form-1.6.5
yesod-newsfeed-1.6.1.0
yesod-persistent-1.6.0.2
yesod-static-1.6.0.1
/home/user/code/myproject/.stack-work/install/x86_64-linux-dkda49f7ca9b244180d3cfb1987cbc9743/lts-13.30/8.6.5/pkgdb
fay-0.24.0.3
fay-base-0.21.1.1
fay-dom-0.5.0.1
fay-text-0.3.2.2
yesod-fay-0.10.0
However trying to set HASKELL_PACKAGE_SANDBOX to the local database as Fay Troubleshooting suggests doesn't work, because sandboxes containing the string .stack are ignored in yesod-fay.
If I remove that check from yesod-fay and force the --package-db to point to the local database, it still doesn't work, complains that fay-base can't find the fay package.
$ stack build
/home/user/code/myproject/src/Handler/Home.hs:121:13: error:
• Exception when trying to run compile-time code:
Unable to compile Fay module "HelloWorld":
ghc: <command line>: cannot satisfy -package fay-base-0.21.1.1:
fay-base-0.21.1.1-91eIy2f24Wa5OHg9LMre7 is unusable due to missing dependencies:
fay-0.24.0.3-CdLcUWVJEOpLCiYHkNVTai
(use -v for more information)
CallStack (from HasCallStack):
error, called at ./Yesod/Fay.hs:483:3 in yesod-fay-0.10.9999-CzTT9fyZ6636pi0gIof7Ge:Yesod.Fay
Code: fayFile' (ConE 'StaticR) "HelloWorld"
• In the untyped splice: $(fayFile' (ConE 'StaticR) "HelloWorld")
|
121 | $( fayFile' (ConE 'StaticR) "HelloWorld" )
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Update: not using satck or cabal and using packages that are installed system-wide, this error doesn't occur. I guess the problem is in my local stack package database (the one in .stack-work)

Answer 1

I concluded that fay doesn't work with stack.