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+error[E0119]: conflicting implementations of trait `AnotherTrait` for type `D<OpaqueType>`
+ --> $DIR/negative-reasoning.rs:19:1
+ |
+LL | impl<T: std::fmt::Debug> AnotherTrait for T {}
+ | ------------------------------------------- first implementation here
+...
+LL | impl AnotherTrait for D<OpaqueType> {
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `D<OpaqueType>`
+ |
+ = note: upstream crates may add a new impl of trait `std::fmt::Debug` for type `OpaqueType` in future versions
+
+error: cannot implement trait on type alias impl trait
+ --> $DIR/negative-reasoning.rs:19:25
+ |
+LL | impl AnotherTrait for D<OpaqueType> {
+ | ^^^^^^^^^^
+ |
+note: type alias impl trait defined here
+ --> $DIR/negative-reasoning.rs:7:19
+ |
+LL | type OpaqueType = impl OpaqueTrait;
+ | ^^^^^^^^^^^^^^^^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0119`.