GHC 8.6.5 diverges due to exponential amount of inlining from Yesod

Summary

It appears that GHC 8.6.5 is diverging when attempting to compile this file. I believe something in surveyForm is the cause. I thought it might be due to the hamlet template haskell, but it still diverges when commenting this out. Maybe it's due to the Applicative constraint solving. I'll keep investigating.

Steps to reproduce

Run stack build in this directory (this will take a while before getting to Forms.Survey).

Expected behavior

Successfully compile Forms.Survey and terminate.

Environment

GHC version used: 8.6.5

Optional:

Operating System: OS X and Ubuntu
System Architecture:

Edited Jan 06, 2020 by Richard Eisenberg

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