error[E0282]: type annotations needed
  --> $DIR/match-unresolved-one-arm.rs:4:9
   |
LL |     let x = match () { //~ ERROR type annotations needed
   |         ^
   |         |
   |         cannot infer type
   |         consider giving `x` a type

error: aborting due to previous error

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