error: `impl` item signature doesn't match `trait` item signature
  --> $DIR/self-without-lifetime-constraint.rs:46:5
   |
LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>;
   |     -------------------------------------------------------------------- expected `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>`
...
LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<&str, &&str> {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ found `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>`
   |
   = note: expected signature `fn(ValueRef<'1>) -> Result<(&'2 str, &'1 &'2 str), FromSqlError>`
              found signature `fn(ValueRef<'1>) -> Result<(&'1 str, &'1 &'1 str), FromSqlError>`
help: the lifetime requirements from the `impl` do not correspond to the requirements in the `trait`
  --> $DIR/self-without-lifetime-constraint.rs:42:60
   |
LL |     fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self, &Self>;
   |                                                            ^^^^ consider borrowing this type parameter in the trait

error[E0515]: cannot return value referencing function parameter `x`
  --> $DIR/self-without-lifetime-constraint.rs:17:87
   |
LL |                 std::str::from_utf8(t).map_err(|_| FromSqlError::InvalidType).map(|x| (x, &x))
   |                                                                                       ^^^^--^
   |                                                                                       |   |
   |                                                                                       |   `x` is borrowed here
   |                                                                                       returns a value referencing data owned by the current function

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0515`.