gistfile1.txt

lowercase = package
UPPERCASE = source


    A
   / \
  c   B

==>  A B c

    A
   / \
  B   c

==>  A B c

    A
    |
    b
    |
    a

==> error circular dep

        A
       / \
      B   c
      |   |
      D   d

==> A B c D

        A
       / \
      b   C
      |   |
      d   D

==> A b C D

    A
   / \
  b   B

==> A B

    A
   / \
  B   b

==> A B

    A
    |
    b
    |
    c

==> A b c

package deps never depend on source deps ALTHOUGH THEY COULD THX TO OVERRIDES, which, I guess, we need to catch an abort

    A
    |
    b (overridden dep: c => C)
    |
    C

==> error: package dep has a source dep (via override?)

Oh, and one these is one that should currently fail by fetching e-2 instead of e-1:

A

/
B C
| |
D e-1
|
e-2

==> A B C D e-1

 A

/
B C
| |
e-1 D
|
e-2

==> A B C D e-1