Update libkv dependency

vendor/golang.org/x/text/width/tables.go

@@ -1,4 +1,4 @@
-// This file was generated by go generate; DO NOT EDIT
+// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
 
 package width
 

vendor/golang.org/x/text/width/transform.go

@@ -14,6 +14,32 @@ type foldTransform struct {
 	transform.NopResetter
 }
 
+func (foldTransform) Span(src []byte, atEOF bool) (n int, err error) {
+	for n < len(src) {
+		if src[n] < utf8.RuneSelf {
+			// ASCII fast path.
+			for n++; n < len(src) && src[n] < utf8.RuneSelf; n++ {
+			}
+			continue
+		}
+		v, size := trie.lookup(src[n:])
+		if size == 0 { // incomplete UTF-8 encoding
+			if !atEOF {
+				err = transform.ErrShortSrc
+			} else {
+				n = len(src)
+			}
+			break
+		}
+		if elem(v)&tagNeedsFold != 0 {
+			err = transform.ErrEndOfSpan
+			break
+		}
+		n += size
+	}
+	return n, err
+}
+
 func (foldTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
 	for nSrc < len(src) {
 		if src[nSrc] < utf8.RuneSelf {
@@ -70,6 +96,33 @@ type narrowTransform struct {
 	transform.NopResetter
 }
 
+func (narrowTransform) Span(src []byte, atEOF bool) (n int, err error) {
+	for n < len(src) {
+		if src[n] < utf8.RuneSelf {
+			// ASCII fast path.
+			for n++; n < len(src) && src[n] < utf8.RuneSelf; n++ {
+			}
+			continue
+		}
+		v, size := trie.lookup(src[n:])
+		if size == 0 { // incomplete UTF-8 encoding
+			if !atEOF {
+				err = transform.ErrShortSrc
+			} else {
+				n = len(src)
+			}
+			break
+		}
+		if k := elem(v).kind(); byte(v) == 0 || k != EastAsianFullwidth && k != EastAsianWide && k != EastAsianAmbiguous {
+		} else {
+			err = transform.ErrEndOfSpan
+			break
+		}
+		n += size
+	}
+	return n, err
+}
+
 func (narrowTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
 	for nSrc < len(src) {
 		if src[nSrc] < utf8.RuneSelf {
@@ -126,6 +179,30 @@ type wideTransform struct {
 	transform.NopResetter
 }
 
+func (wideTransform) Span(src []byte, atEOF bool) (n int, err error) {
+	for n < len(src) {
+		// TODO: Consider ASCII fast path. Special-casing ASCII handling can
+		// reduce the ns/op of BenchmarkWideASCII by about 30%. This is probably
+		// not enough to warrant the extra code and complexity.
+		v, size := trie.lookup(src[n:])
+		if size == 0 { // incomplete UTF-8 encoding
+			if !atEOF {
+				err = transform.ErrShortSrc
+			} else {
+				n = len(src)
+			}
+			break
+		}
+		if k := elem(v).kind(); byte(v) == 0 || k != EastAsianHalfwidth && k != EastAsianNarrow {
+		} else {
+			err = transform.ErrEndOfSpan
+			break
+		}
+		n += size
+	}
+	return n, err
+}
+
 func (wideTransform) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
 	for nSrc < len(src) {
 		// TODO: Consider ASCII fast path. Special-casing ASCII handling can

vendor/golang.org/x/text/width/trieval.go

@@ -1,4 +1,4 @@
-// This file was generated by go generate; DO NOT EDIT
+// Code generated by running "go generate" in golang.org/x/text. DO NOT EDIT.
 
 package width
 

vendor/golang.org/x/text/width/width.go

@@ -153,17 +153,22 @@ func (p Properties) Wide() rune {
 
 // Transformer implements the transform.Transformer interface.
 type Transformer struct {
-	t transform.Transformer
+	t transform.SpanningTransformer
 }
 
 // Reset implements the transform.Transformer interface.
 func (t Transformer) Reset() { t.t.Reset() }
 
-// Transform implements the Transformer interface.
+// Transform implements the transform.Transformer interface.
 func (t Transformer) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
 	return t.t.Transform(dst, src, atEOF)
 }
 
+// Span implements the transform.SpanningTransformer interface.
+func (t Transformer) Span(src []byte, atEOF bool) (n int, err error) {
+	return t.t.Span(src, atEOF)
+}
+
 // Bytes returns a new byte slice with the result of applying t to b.
 func (t Transformer) Bytes(b []byte) []byte {
 	b, _, _ = transform.Bytes(t, b)