error[E0393]: the type parameter `T` must be explicitly specified
--> $DIR/E0393.rs:3:47
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+LL | trait A<T=Self> {}
+ | ------------------ type parameter `T` must be specified for this
+LL |
LL | fn together_we_will_rule_the_galaxy(son: &dyn A) {}
- | ^ missing reference to `T`
+ | ^ help: set the type parameter to the desired type: `A<T>`
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= note: because of the default `Self` reference, type parameters must be specified on object types