How to create coverage overlay using HPC and Stack?

Question

How to create coverage overlay using HPC and Stack?

I have a small / medium sized Haskell database for which I would like to create a coverage report. By default, the coverage report provided by HPC is filled with false negatives (for example, I use lenses to access most of my recording fields, and not automatically generated ones, which HPC then reports that they are not covered).

A typical solution for this is to create some kind of overlay, as indicated here: https://wiki.haskell.org/Haskell_program_coverage#Hpc_toolkit

When I try to do this with Stack, I run into a problem.

$ stack new --resolver=lts-9.5 hpcTest

If we edit src/Lib.hsas follows:

module Lib
( someFunc, otherFunc
) where

someFunc :: IO ()
someFunc = putStrLn "someFunc"

otherFunc :: IO ()
otherFunc = putStrLn "otherFunc"

and test/spec.hs:

import Lib

main :: IO ()
main = someFunc

and run stack test --coverage

, 100%, , wiki, : stack exec hpc -- draft --hpcdir=.stack-work/dist/x86_64-linux/Cabal-1.24.2.0/hpc/ --srcdir=. .stack-work/install/x86_64-linux/lts-9.5/8.0.2/hpc/hpcTest/hpcTest-test/hpcTest-test.tix > myDraft.txt

, myDraft.txt:

module "hpcTest-0.1.0.0-HnYRxRg1qoiyMKwsCMtby:Lib" {
  tick function "otherFunc" on line 9;
}

stack exec hpc -- overlay --hpcdir=.stack-work/dist/x86_64-linux/Cabal-1.24.2.0/hpc/ --srcdir=. myDraft.txt, , :

hpc: can not find hpcTest-0.1.0.0-HnYRxRg1qoiyMKwsCMtby:Lib in ./.hpc, ./.stack-work/dist/x86_64-linux/Cabal-1.24.2.0/hpc/
CallStack (from HasCallStack):
  error, called at libraries/hpc/Trace/Hpc/Mix.hs:122:15 in hpc-0.6.0.3:Trace.Hpc.Mix