situation with stack repl --package and multiple packages is unclear

[simonmichael]

stack repl --package's help suggests it can support multiple packages, but it gives an obscure error for the obvious syntaxes (comma or space-separated, as supported by stack script --package):

$ stack --version
Version 2.5.1, Git revision d6ab861544918185236cf826cb2028abb266d6d5 x86_64 hpack-0.33.0
$ stack repl --help | grep '\--package'
                  [--with-ghc GHC] [--[no-]load] [--package PACKAGE(S)]
  --package PACKAGE(S)     Additional package(s) that must be installed
$ stack repl Shake.hs --package regex,shake
Error parsing targets: Directory not found: regex,shake
$ stack repl Shake.hs --package 'regex shake'
Error parsing targets: Directory not found: regex shake

PS I'm interested in this because specifying multiple packages without using a space seems possibly helpful in hie.yaml files.

[qrilka]

As far as I understand the way to use multiple package would be by repeating --package <package for every one of them, probably we should improve CLI help here.

[mpilgrem]

I am closing because the current stack repl --help explains:

--package PACKAGE        Add a package (can be specified multiple times)

and that is consistent with Stack.Config.packagesParser.