const internal/types/errors.MultiValAssignOp

3 uses

	internal/types/errors (current package)
		code_string.go#L31: 	_ = x[MultiValAssignOp-20]
		codes.go#L201: 	MultiValAssignOp

	go/types
		stmt.go#L531: 				check.errorf(inNode(s, s.TokPos), MultiValAssignOp, "assignment operation %s requires single-valued expressions", s.Tok)