Haskell project with Stack on CircleCI

circle.yml

dependencies:
  cache_directories:
    - "~/.stack"
  pre:
    - wget https://github.com/commercialhaskell/stack/releases/download/v0.1.2.0/stack-0.1.2.0-x86_64-linux.gz -O /tmp/stack.gz
    - gunzip /tmp/stack.gz && chmod +x /tmp/stack
    - sudo mv /tmp/stack /usr/bin/stack
  override:
    - stack setup
    - stack build

test:
  override:
    - stack test

I think is better to use this way:

dependencies:
  cache_directories:
    - "~/.stack"
  pre:
    - wget https://github.com/commercialhaskell/stack/releases/download/v1.2.0/stack-1.2.0-linux-x86_64.tar.gz -O /tmp/stack.tar.gz
    - mkdir /tmp/stack/
    - tar -xvzf /tmp/stack.tar.gz -C /tmp/stack/
    - sudo mv /tmp/stack/stack-1.2.0-linux-x86_64/stack /usr/bin/stack
  override:
    - stack setup --no-terminal
    - stack build --no-system-ghc --only-configure --no-terminal

compile:
  override:
    - stack build --no-terminal

test:
  override:
    - stack test --no-terminal