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Pants

Ah. Thank you :slightly_smiling_face: That is... not a very clear exception message.

i am running into the same thing too and making this message better would be really useful

i think phase one is maybe improving the graph visualization: <https://github.com/pantsbuild/pants/pull/7024>

making this particular error better could be accomplished in the `Get` constructor, by checking that types are accurate in the three arg form

would love to help answer questions or pair on that if anyone's interested

i really like how orthogonal everything is

(ie: either a union, or an exact type match)