better prints

generator.v

@@ -186,17 +186,21 @@ fn (mut g Generator) gen_expr(expr Expr) {
 					g.out.write_string('printf(\"')
 					dump(label);
 					if label != "" {
-						g.out.write_string('${label}')
+						g.out.write_string('(${label}')
 						g.out.write_string(': ');
 					}
 					format := get_type_format(expr_type)
-					g.out.write_string('%${format}\", ')
+					g.out.write_string('%${format}')
+					if label != "" {
+						g.out.write_string(')')
+					}
+					g.out.write_string('\", ')
 					g.gen_expr(inner_expr)
 					g.out.write_string(');')
 				}
 				i++;
 				if i < expr.exprs.len {
-					g.out.write_string('printf(\", \");')
+					g.out.write_string('printf(\" \");')
 				}
 			}
 			g.out.write_string('printf(\"\\n\");\n')