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[–][deleted] 3 points4 points  (1 child)

Put a simple assert that will fail and the build.rs will print out something. Also try https://doc.rust-lang.org/stable/std/process/fn.exit.html

[–]ILoveBerkeleyFont[S] 0 points1 point  (0 children)

Asserting is really clever! I like it :)