error[E0495]: cannot infer an appropriate lifetime for lifetime parameter `'a` due to conflicting requirements
  --> $DIR/type-alias-free-regions.rs:17:9
   |
LL |         C { f: b }
   |         ^
   |
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the method body at 16:5...
  --> $DIR/type-alias-free-regions.rs:16:5
   |
LL | /     fn from_box(b: Box<B>) -> Self {
LL | |         C { f: b }
LL | |     }
   | |_____^
note: ...so that the expression is assignable
  --> $DIR/type-alias-free-regions.rs:17:16
   |
LL |         C { f: b }
   |                ^
   = note: expected  `std::boxed::Box<std::boxed::Box<&isize>>`
              found  `std::boxed::Box<std::boxed::Box<&isize>>`
note: but, the lifetime must be valid for the lifetime `'a` as defined on the impl at 15:6...
  --> $DIR/type-alias-free-regions.rs:15:6
   |
LL | impl<'a> FromBox<'a> for C<'a> {
   |      ^^
note: ...so that the expression is assignable
  --> $DIR/type-alias-free-regions.rs:17:9
   |
LL |         C { f: b }
   |         ^^^^^^^^^^
   = note: expected  `C<'a>`
              found  `C<'_>`

error[E0495]: cannot infer an appropriate lifetime due to conflicting requirements
  --> $DIR/type-alias-free-regions.rs:27:16
   |
LL |         C { f: Box::new(b.0) }
   |                ^^^^^^^^^^^^^
   |
note: first, the lifetime cannot outlive the anonymous lifetime #1 defined on the method body at 26:5...
  --> $DIR/type-alias-free-regions.rs:26:5
   |
LL | /     fn from_tuple(b: (B,)) -> Self {
LL | |         C { f: Box::new(b.0) }
LL | |     }
   | |_____^
note: ...so that the expression is assignable
  --> $DIR/type-alias-free-regions.rs:27:25
   |
LL |         C { f: Box::new(b.0) }
   |                         ^^^
   = note: expected  `std::boxed::Box<&isize>`
              found  `std::boxed::Box<&isize>`
note: but, the lifetime must be valid for the lifetime `'a` as defined on the impl at 25:6...
  --> $DIR/type-alias-free-regions.rs:25:6
   |
LL | impl<'a> FromTuple<'a> for C<'a> {
   |      ^^
note: ...so that the expression is assignable
  --> $DIR/type-alias-free-regions.rs:27:9
   |
LL |         C { f: Box::new(b.0) }
   |         ^^^^^^^^^^^^^^^^^^^^^^
   = note: expected  `C<'a>`
              found  `C<'_>`

error: aborting due to 2 previous errors

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