Add examples of all three syntaxes in method syntax chapter of trpl
Fixes #18787
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@ -50,7 +50,28 @@ You can think of this first parameter as being the `x` in `x.foo()`. The three
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variants correspond to the three kinds of thing `x` could be: `self` if it's
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just a value on the stack, `&self` if it's a reference, and `&mut self` if it's
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a mutable reference. We should default to using `&self`, as it's the most
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common.
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common. Here's an example of all three variants:
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```rust
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struct Circle {
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x: f64,
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y: f64,
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radius: f64,
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}
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impl Circle {
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fn reference(&self) {
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println!("taking self by reference!");
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}
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fn mutable_reference(&mut self) {
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println!("taking self by mutable reference!");
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}
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fn takes_ownership(self) {
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println!("taking ownership of self!");
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}
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```
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Finally, as you may remember, the value of the area of a circle is `π*r²`.
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Because we took the `&self` parameter to `area`, we can use it just like any
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