error[E0282]: type annotations needed
  --> $DIR/match-unresolved-one-arm.rs:4:9
   |
LL |     let x = match () {
   |         ^
   |
help: consider giving `x` an explicit type
   |
LL |     let x: /* Type */ = match () {
   |          ++++++++++++

error: aborting due to 1 previous error

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