rel := filepath.ToSlash(str.TrimFilePathPrefix(file, pkgdir))

			what := "file"
			info, err := fsys.Lstat(file)
			if err != nil {
				return nil, nil, err
			}
			if info.IsDir() {
				what = "directory"
			}

			// Check that directories along path do not begin a new module
			// (do not contain a go.mod).
			for dir := file; len(dir) > len(pkgdir)+1 && !dirOK[dir]; dir = filepath.Dir(dir) {

//		dependencies of the main package (other packages are not affected).
//		Special name "off" turns off PGO. The default is "auto".
//	-pkgdir dir
//		install and load all packages from dir instead of the usual locations.
//		For example, when building with a non-standard configuration,
//		use -pkgdir to keep generated packages in a separate location.
//	-tags tag,list
//		a comma-separated list of additional build tags to consider satisfied

Isaac.Newton-Opticks.txt Produced by Suzanne Lybarger, steve harris, Josephine Paolucci and the Online Distributed Proofreading Team at http://www.pgdp.net. OPTICKS: OR, A TREATISE OF THE _Reflections_, _Refractions_, _Inflections_ and _Colours_ OF LIGHT. _The_ FOURTH EDITION, _corrected_. By Sir _ISAAC NEWTON_, Knt. LONDON: Printed for WILLIAM INNYS at the West-End of St. _Paul's_. MDCCXXX. TITLE PAGE OF THE 1730 EDITION SIR ISAAC NEWTON'S ADVERTISEMENTS Advertisement I _Part of the ensuing Discourse...