fix clippy warning

yjhmelody · yjhmelody · commit c758b3629ba1 · 2019-08-12T23:47:20.000+08:00
Signed-off-by: yjhmelody &lt;465402634@qq.com&gt;
diff --git a/vm/src/obj/objint.rs b/vm/src/obj/objint.rs
@@ -671,7 +671,7 @@ pub fn to_int(vm: &VirtualMachine, obj: &PyObjectRef, mut base: u32) -> PyResult
     if base == 0 {
         base = 10
     } else if base < 2 || base > 36 {
-        return Err(vm.new_value_error(format!("int() base must be >= 2 and <= 36, or 0")));
+        return Err(vm.new_value_error("int() base must be >= 2 and <= 36, or 0".to_string()));
     }
 
     match_class!(obj.clone(),

Original file line number	Diff line number	Diff line change
`@@ -671,7 +671,7 @@ pub fn to_int(vm: &VirtualMachine, obj: &PyObjectRef, mut base: u32) -> PyResult`
`671`	`671`	`if base == 0 {`
`672`	`672`	`base = 10`
`673`	`673`	`} else if base < 2 \|\| base > 36 {`
`674`		`- return Err(vm.new_value_error(format!("int() base must be >= 2 and <= 36, or 0")));`
	`674`	`+ return Err(vm.new_value_error("int() base must be >= 2 and <= 36, or 0".to_string()));`
`675`	`675`	`}`
`676`	`676`
`677`	`677`	`match_class!(obj.clone(),`