Fix node type checks in arithmetic expressions.

rules/ast/ast.go

@@ -540,14 +540,18 @@ func NewFunctionCall(function *Function, args []Node) (Node, error) {
 
 func nodesHaveTypes(nodes []Node, exprTypes []ExprType) bool {
 	for _, node := range nodes {
+                correctType := false
 		for _, exprType := range exprTypes {
 			if node.Type() == exprType {
-				return true
-			}
+				correctType = true
 			}
 		}
+                if !correctType {
                         return false
                 }
+	}
+	return true
+}
 
 func NewArithExpr(opType BinOpType, lhs Node, rhs Node) (Node, error) {
 	if !nodesHaveTypes([]Node{lhs, rhs}, []ExprType{SCALAR, VECTOR}) {