index := -1 // index of matching error
		var delta int
		for _, i := range indices {
			if d := absDiff(gotPos.Column, errList[i].col); index < 0 || d < delta {
				index, delta = i, d
			}
		}

		// The closest column position must be within expected colDelta.
		const colDelta = 0 // go/types errors are positioned correctly
		if delta > colDelta {

)

// TestResolution checks that identifiers are resolved to the declarations
// annotated in the source, by comparing the positions of the resulting
// Ident.Obj.Decl to positions marked in the source via special comments.
//
// In the test source, any comment prefixed with '=' or '@' (or both) marks the
// previous token position as the declaration ('=') or a use ('@') of an
// identifier. The text following '=' and '@' in the comment string is the

	// By scanning backward, we can keep track of whether the current
	// position is type-S or type-L according to the usual definition:
	//
	//	- position len(text) is type S with text[len(text)] == -1 (the sentinel)
	//	- position i is type S if text[i] < text[i+1], or if text[i] == text[i+1] && i+1 is type S.
	//	- position i is type L if text[i] > text[i+1], or if text[i] == text[i+1] && i+1 is type L.
	//

	imps := make([]*ast.ImportSpec, len(origImps))
	copy(imps, origImps)
	// Assume the imports are sorted by position.
	slices.SortFunc(imps, func(a, b *ast.ImportSpec) int {
		return cmp.Compare(a.Pos(), b.Pos())
	})
	// Assume gofmt has been applied, so there is a blank line between adjacent imps
	// if and only if they are more than 2 positions apart (newline, tab).
	var groupStarts []*ast.ImportSpec
	prevEnd := token.Pos(-2)

func (s *fakeFileSet) pos(file string, line, column int) token.Pos {
	// TODO(mdempsky): Make use of column.

	// Since we don't know the set of needed file positions, we reserve
	// maxlines positions per file. We delay calling token.File.SetLines until
	// all positions have been calculated (by way of fakeFileSet.setLines), so
	// that we can avoid setting unnecessary lines. See also golang/go#46586.
	f := s.files[file]
	if f == nil {

		if isWildcard(name) {
			if old, ok := m[name]; ok {
				return subst(nil, old, reflect.Value{})
			}
		}
	}

	if pos.IsValid() && pattern.Type() == positionType {
		// use new position only if old position was valid in the first place
		if old := pattern.Interface().(token.Pos); !old.IsValid() {
			return pattern
		}
		return pos
	}

	// Otherwise copy.
	switch p := pattern; p.Kind() {

	for id, obj := range info.Uses {
		posn := fset.Position(id.Pos())
		lineCol := fmt.Sprintf("%d:%d", posn.Line, posn.Column)
		usesByObj[obj] = append(usesByObj[obj], lineCol)
	}
	var items []string
	for obj, uses := range usesByObj {
		slices.Sort(uses)
		item := fmt.Sprintf("%s:\n  defined at %s\n  used at %s",
			types.ObjectString(obj, types.RelativeTo(pkg)),
			fset.Position(obj.Pos()),
			strings.Join(uses, ", "))

	}, {
		err:        fmt.Errorf("%s %w %v", "prefix", wrapped, "suffix"),
		wantText:   "prefix inner error suffix",
		wantUnwrap: wrapped,
	}, {
		err:        fmt.Errorf("%[2]s: %[1]w", wrapped, "positional verb"),
		wantText:   "positional verb: inner error",
		wantUnwrap: wrapped,
	}, {
		err:      fmt.Errorf("%v", wrapped),
		wantText: "inner error",
	}, {
		err:      fmt.Errorf("added context: %v", wrapped),

}

// InputOffset returns the input stream byte offset of the current reader
// position. The offset gives the location of the end of the most recently
// read row and the beginning of the next row.
func (r *Reader) InputOffset() int64 {
	return r.offset
}

// pos holds the position of a field in the current line.
type position struct {
	line, col int
}

// ReadAll reads all the remaining records from r.

                    FunctionArgument.Positional [indexes: 2..3, line/column: 1/3..1/4, file: test] (
                        expr = IntLiteral [indexes: 2..3, line/column: 1/3..1/4, file: test] (1)
                    )
                    FunctionArgument.Positional [indexes: 5..6, line/column: 1/6..1/7, file: test] (
                        expr = PropertyAccess [indexes: 5..6, line/column: 1/6..1/7, file: test] (