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error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'b` due to conflicting requirements
  --> $DIR/trait-impl-of-supertrait-has-wrong-lifetime-parameters.rs:34:13
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime
   |             ^^^^^^^^^^
   |
note: first, the lifetime cannot outlive the lifetime 'a as defined on the impl at 34:6...
  --> $DIR/trait-impl-of-supertrait-has-wrong-lifetime-parameters.rs:34:6
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime
   |      ^^
note: ...but the lifetime must also be valid for the lifetime 'b as defined on the impl at 34:9...
  --> $DIR/trait-impl-of-supertrait-has-wrong-lifetime-parameters.rs:34:9
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> { //~ ERROR cannot infer an appropriate lifetime
   |         ^^
   = note: ...so that the types are compatible:
           expected T1<'a>
              found T1<'_>

error: aborting due to previous error

For more information about this error, try `rustc --explain E0495`.