Failed to compile a sanity check

[alnvnjr]

Hi - After months of successful deploys Heroku is complaining about a sanity check. In past deploys stack used a sandboxed ghc but here it seems stack is looking for and not finding a specific ghc. Does this error look familiar? I can provide more info as needed. Thank you for your help!

remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Haskell app detected
remote: -----> 2020-07-28_15:37:56 Starting...
remote: -----> 2020-07-28_15:37:56 Exporting config vars
remote: -----> 2020-07-28_15:37:56 Restoring 6.0.0a files from cache
remote: -----> 2020-07-28_15:37:56 Restoring stack-2.3.1
remote: -----> 2020-07-28_15:37:56 Substituting stack vars
remote: -----> 2020-07-28_15:37:56 Restoring .stack-work
remote: -----> 2020-07-28_15:37:59 Running stack
remote: The GHC located at /tmp/codon/tmp/cache/.stack/programs/x86_64-linux/ghc-8.8.3/bin/ghc-8.8.3 failed to compile a sanity check. Please see:
remote: 
remote:     http://docs.haskellstack.org/en/stable/install_and_upgrade/
remote: 
remote: for more information. Exception was:
remote: Received ExitFailure 127 when running
remote: Raw command: /tmp/codon/tmp/cache/.stack/programs/x86_64-linux/ghc-8.8.3/bin/ghc-8.8.3 /tmp/stack-sanity-check-29d325f04e9a0571/Main.hs -no-user-package-db
remote: Run from: /tmp/stack-sanity-check-29d325f04e9a0571/
remote: Standard error:
remote: 
remote: /tmp/codon/tmp/cache/.stack/programs/x86_64-linux/ghc-8.8.3/bin/ghc-8.8.3: 9: exec: /app/tmp/cache/.stack/programs/x86_64-linux/ghc-8.8.3/lib/ghc-8.8.3/bin/ghc: not found
remote: 
remote:  !     Push rejected, failed to compile Haskell app.

[froth]

same here

[pianostringquartet]

Hello, I'm also encountering this issue.

[pianostringquartet]

I suspected that reverting to 2.1.3 (i.e. undoing cc8d329) would help since the buildpack was working fine for me prior to that stack version update (to 2.3.1).

Unfortunately, that did not resolve the issue.

remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Haskell app detected
remote: -----> 2020-08-19_22:31:24 Starting...
remote: -----> 2020-08-19_22:31:24 Exporting config vars
remote: -----> 2020-08-19_22:31:25 Restoring 6.0.0a files from cache
remote: -----> 2020-08-19_22:31:25 Restoring stack-2.1.3
remote: -----> 2020-08-19_22:31:27 Substituting stack vars
remote: -----> 2020-08-19_22:31:27 Restoring .stack-work
remote: -----> 2020-08-19_22:31:30 Running stack
remote: The GHC located at /tmp/codon/tmp/cache/.stack/programs/x86_64-linux/ghc-8.6.5/bin/ghc-8.6.5 failed to compile a sanity check. Please see:
remote:
remote:     http://docs.haskellstack.org/en/stable/install_and_upgrade/
remote:
remote: for more information. Exception was:
remote: Received ExitFailure 127 when running
remote: Raw command: /tmp/codon/tmp/cache/.stack/programs/x86_64-linux/ghc-8.6.5/bin/ghc-8.6.5 /tmp/stack-sanity-check119/Main.hs -no-user-package-db
remote: Run from: /tmp/stack-sanity-check119/
remote: Standard error:
remote:
remote: /tmp/codon/tmp/cache/.stack/programs/x86_64-linux/ghc-8.6.5/bin/ghc-8.6.5: 9: exec: /app/tmp/cache/.stack/programs/x86_64-linux/ghc-8.6.5/lib/ghc-8.6.5/bin/ghc: not found
remote:
remote:  !     Push rejected, failed to compile Haskell app.

[pianostringquartet]

In past deploys stack used a sandboxed ghc but here it seems stack is looking for and not finding a specific ghc

I also noticed this; however mine is looking for ghc-8.6.5 (which is tied to the resolver: lts-14.7 I'm using in my stack.yaml), while yours is looking for ghc-8.8.3.

[mfine]

Try clearing your build caches to see if the clears stuff up: link.

[pianostringquartet]

Excellent! Thank you @mfine, clearing my build cache per the instructions in the link completely resolved the issue.