Lib.hs

module Lib where

foo = ()

Main.hs

module Main where

main :: IO ()
main = putStrLn "Hello, Haskell!"

repro-stack-build-tool-depends-cycle.cabal

name:                repro-stack-build-tool-depends-cycle
version:             0.1.0.0
author:              Daniel Gröber
maintainer:          [email protected]
build-type:          Simple
cabal-version:       >=1.10

library
  build-depends:       base
  default-language:    Haskell2010

  build-tool-depends:  repro-stack-build-tool-depends-cycle:myexe

executable myexe
  main-is:             Main.hs
  build-depends:       base
  default-language:    Haskell2010

stack.yaml

resolver: lts-12.7
packages:
- .