error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'b` due to conflicting requirements
  --> $DIR/impl-of-supertrait-has-wrong-lifetime-parameters.rs:24:28
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> {
   |                            ^^^^^^^^^
   |
note: first, the lifetime cannot outlive the lifetime `'a` as defined here...
  --> $DIR/impl-of-supertrait-has-wrong-lifetime-parameters.rs:24:6
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> {
   |      ^^
note: ...but the lifetime must also be valid for the lifetime `'b` as defined here...
  --> $DIR/impl-of-supertrait-has-wrong-lifetime-parameters.rs:24:9
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> {
   |         ^^
note: ...so that the types are compatible
  --> $DIR/impl-of-supertrait-has-wrong-lifetime-parameters.rs:24:28
   |
LL | impl<'a,'b> T2<'a, 'b> for S<'a, 'b> {
   |                            ^^^^^^^^^
   = note: expected `T1<'a>`
              found `T1<'_>`

error: aborting due to previous error

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