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diff --git a/vendor/golang.org/x/text/internal/colltab/weighter.go b/vendor/golang.org/x/text/internal/colltab/weighter.go
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+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package colltab // import "golang.org/x/text/internal/colltab"
+
+// A Weighter can be used as a source for Collator and Searcher.
+type Weighter interface {
+	// Start finds the start of the segment that includes position p.
+	Start(p int, b []byte) int
+
+	// StartString finds the start of the segment that includes position p.
+	StartString(p int, s string) int
+
+	// AppendNext appends Elems to buf corresponding to the longest match
+	// of a single character or contraction from the start of s.
+	// It returns the new buf and the number of bytes consumed.
+	AppendNext(buf []Elem, s []byte) (ce []Elem, n int)
+
+	// AppendNextString appends Elems to buf corresponding to the longest match
+	// of a single character or contraction from the start of s.
+	// It returns the new buf and the number of bytes consumed.
+	AppendNextString(buf []Elem, s string) (ce []Elem, n int)
+
+	// Domain returns a slice of all single characters and contractions for which
+	// collation elements are defined in this table.
+	Domain() []string
+
+	// Top returns the highest variable primary value.
+	Top() uint32
+}