E0079

Warning name: implicit_impl_as_method

Methods from an impl Trait for Type declaration are being attached to Type implicitly. This compatibility behavior is deprecated because it is not explicit or refactoring-safe. The warning is disabled by default in v0.10.4.

Erroneous example

///|
pub(open) trait Render {
  fn render(Self) -> String
}

///|
pub(all) struct Badge(String)

///|
pub impl Render for Badge with render(self) {
  self.0
}

///|
pub fn show_badge(badge : Badge) -> String {
  badge.render()
}

Suggestion

Use extend Type with Trait::{method} for methods that should support dot syntax. Otherwise, call the implementation as Trait::method(value).

///|
pub(open) trait Render {
  fn render(Self) -> String
}

///|
pub(all) struct Badge(String)

///|
pub impl Render for Badge with render(self) {
  self.0
}

///|
pub extend Badge with Render::{render}

///|
pub fn show_badge(badge : Badge) -> String {
  badge.render()
}