} else if errors.Is(r.err, imports.ErrNoGo) {
					// ImportDir said there were files in the package, but the module
					// loader said there weren't. Which one is right?
					// Without this special-case hack, the TestScript/test_vet case fails
					// on the vetfail/p1 package (added in CL 83955).
					// Apparently, imports.ShouldBuild biases toward rejecting files
					// with invalid build constraints, whereas ImportDir biases toward