warning: not reporting region error due to nll
  --> $DIR/ex3-both-anon-regions-one-is-struct-3.rs:14:11
   |
LL |     y.b = x; //~ ERROR lifetime mismatch
   |           ^

error[E0623]: lifetime mismatch
  --> $DIR/ex3-both-anon-regions-one-is-struct-3.rs:14:5
   |
LL | fn foo(mut y: Ref, x: &u32) {
   |               ---     ---- these two types are declared with different lifetimes...
LL |     y.b = x; //~ ERROR lifetime mismatch
   |     ^^^^^^^ ...but data from `x` flows into `y` here

error: aborting due to previous error

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