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Idiomatic: Simplify example in method resolution slide #3166

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Idiomatic: Simplify example in method resolution slide #3166

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16 changes: 2 additions & 14 deletions ...atic/leveraging-the-type-system/extension-traits/method-resolution-conflicts.md
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Expand Up @@ -64,20 +64,8 @@ fn main() {
a method they're relying on is not producing expected behavior. Avoid name
conflicts instead of relying on this mechanism if you can.

Demonstrate: Change the signature and implementation of
`CountOnesExt::count_ones` to `fn count_ones(&mut self) -> u32` and modify the
invocation accordingly:

```rust
# // Copyright 2025 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
assert_eq!((&mut -1i32).count_ones(), 32);
```

`CountOnesExt::count_ones` is invoked, rather than the inherent method, since
`&mut self` has a higher priority than `&self`, the one used by the inherent
method.
Demonstrate: Change the call to `(&-1i32).count_ones()` and demonstrate that
the trait method is now called instead.

If an immutable inherent method and a mutable trait method exist for the same
type, we can specify which one to use at the call site by using
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