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+error[E0393]: the type parameter `T` must be explicitly specified
+ --> $DIR/E0393.rs:3:47
+ |
+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) {}
+ | ^ help: set the type parameter to the desired type: `A<T>`
+ |
+ = note: because of the default `Self` reference, type parameters must be specified on object types
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0393`.