stack init in multi-package project should use local packages for dependency checking

[snoyberg]

For example: if you have two packages foo and bar, and bar depends on foo, stack init won't find a matching snapshot since none of them provide foo. Instead, we should include information about the provided local packages.

[tel]

Is doing this documented anywhere? The test directory lacks a stack.yaml so I'm not sure how to replicate it.

[tel]

Oh, nevermind. It's documented under "multi-package".