warning: not reporting region error due to nll
  --> $DIR/ex3-both-anon-regions-both-are-structs-2.rs:16:11
   |
LL |     x.b = y.b; //~ ERROR lifetime mismatch
   |           ^^^

error[E0623]: lifetime mismatch
  --> $DIR/ex3-both-anon-regions-both-are-structs-2.rs:16:5
   |
LL | fn foo(mut x: Ref, y: Ref) {
   |               ---     --- these two types are declared with different lifetimes...
LL |     x.b = y.b; //~ ERROR lifetime mismatch
   |     ^^^^^^^^^ ...but data from `y` flows into `x` here

error: aborting due to previous error

For more information about this error, try `rustc --explain E0623`.