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error[E0308]: mismatched types
  --> $DIR/issue-118809.rs:7:10
   |
LL | #[derive(Deserialize)]
   |          ^^^^^^^^^^^
   |          |
   |          expected `u64`, found `u32`
   |          arguments to this enum variant are incorrect
   |
help: the type constructed contains `u32` due to the type of the argument passed
  --> $DIR/issue-118809.rs:7:10
   |
LL | #[derive(Deserialize)]
   |          ^^^^^^^^^^^ this argument influences the type of `Some`
note: tuple variant defined here
  --> $SRC_DIR/core/src/option.rs:LL:COL
   = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.