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add a ui test for
.as_ref
suggestion
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// run-rustfix | ||
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fn _foo(opt: &Option<Box<i32>>) -> String { | ||
opt.as_ref().map(|x| x.to_string()).unwrap_or_else(String::new) | ||
//~^ cannot move out of `*opt` which is behind a shared reference | ||
} | ||
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fn main(){} |
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// run-rustfix | ||
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fn _foo(opt: &Option<Box<i32>>) -> String { | ||
opt.map(|x| x.to_string()).unwrap_or_else(String::new) | ||
//~^ cannot move out of `*opt` which is behind a shared reference | ||
} | ||
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fn main(){} |
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error[E0507]: cannot move out of `*opt` which is behind a shared reference | ||
--> $DIR/option_as_ref.rs:4:5 | ||
| | ||
LL | opt.map(|x| x.to_string()).unwrap_or_else(String::new) | ||
| ^^^^---------------------- | ||
| | | | ||
| | `*opt` moved due to this method call | ||
| move occurs because `*opt` has type `Option<Box<i32>>`, which does not implement the `Copy` trait | ||
| | ||
note: this function takes ownership of the receiver `self`, which moves `*opt` | ||
--> $SRC_DIR/core/src/option.rs:LL:COL | ||
| | ||
LL | pub const fn map<U, F>(self, f: F) -> Option<U> | ||
| ^^^^ | ||
help: consider calling `.as_ref()` to borrow the type's contents | ||
| | ||
LL | opt.as_ref().map(|x| x.to_string()).unwrap_or_else(String::new) | ||
| +++++++++ | ||
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error: aborting due to previous error | ||
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For more information about this error, try `rustc --explain E0507`. |