Cannot build only a single component

[ksvanhorn]

I've been going through the "In-depth guide to stack" document at https://www.fpcomplete.com/blog/2015/08/new-in-depth-guide-stack. In the section "Components, --test, and --bench", when I follow along and do "stack clean" followed by "stack build :helloworld-test", stack insists on building everything, including building and installing the executable. According to all documentation I can find, it should not build the executable.

Here is the full output I get:
output.txt

[mgsloan]

Stack can build a single component. The issue is that it needs to build all the executables along with the library. This happened due to a few things:

• Stack doesn't seem to handle projects with custom Setup.hs or submodules well? #1203 causing a move to copy + register instead of install
• The copy command fails when building only some executables: copy command fails when building only some components haskell/cabal#2780

Closing as a dupe of #1406 , and bumping that issue's priority.