// version. (See https://golang.org/issue/34189.)
			//
			// We know of at least two examples where this behavior is desired
			// (github.com/russross/blackfriday@v2.0.0 and
			// github.com/libp2p/go-libp2p@v6.0.23), and (as of 2019-10-29) have no
			// concrete examples for which it is undesired.
			return versions, nil
		}
	}

	var (
		lastMajor         string
		lastMajorHasGoMod bool
	)

	globalSkip(t)
	goCmd(t, "install", "-buildmode=shared", "-linkshared", "./depBase")
	goCmd(t, "install", "-linkshared", "./exe")

	// If we make an ABI-breaking change to depBase and rebuild libp.so but not exe,
	// exe will abort with a complaint on startup.
	// This assumes adding an exported function breaks ABI, which is not true in
	// some senses but suffices for the narrow definition of ABI compatibility the