이펙티브 러스트

75

1

장

타입

없다는 것이다.

오류가 발생하는 코드

let builder = DetailsBuilder::new(

"Robert",

"Builder",

time::Date::from_calendar_date(1998, time::Month::November, 28)

.unwrap(),

);

if informal {

builder.preferred_name("Bob");

}

let bob = builder.build();

error[E0382]: use of moved value: `builder`

--> src/main.rs:256:15

|

247 | let builder = DetailsBuilder::new(

| ------- move occurs because `builder` has type `DetailsBuilder`,

| which does not implement the `Copy` trait

...

254 | builder.preferred_name("Bob");

| --------------------- `builder` moved due to this method

| call

255 | } 256 | let bob = builder.build();

| ^^^^^^^ value used here after move

|

note: `DetailsBuilder::preferred_name` ...