File: generic-type-params-forward-mention.stderr

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error[E0128]: generic parameters with a default cannot use forward declared identifiers
  --> $DIR/generic-type-params-forward-mention.rs:2:23
   |
LL | struct Foo<T = Option<U>, U = bool>(T, U);
   |                       ^ defaulted generic parameters cannot be forward declared

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0128`.