Imports of package diff

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
golang.org/x/tools/internal/lsp/diff/lcs
golang.org/x/tools/internal/span
sortPackage sort provides primitives for sorting slices and user-defined collections.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.
unicode/utf8Package utf8 implements functions and constants to support text encoded in UTF-8.