error[E0282]: type annotations needed for `&_`
  --> $DIR/issue-12187-1.rs:6:9
   |
LL |     let &v = new();
   |         ^^   ----- type must be known at this point
   |
help: consider giving this pattern a type, where the type for type parameter `T` is specified
   |
LL |     let &v: &T = new();
   |           ++++

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0282`.