error[E0308]: mismatched types
  --> $DIR/len.rs:3:10
   |
LL |     test(array.len());
   |     ---- ^^^^^^^^^^^ expected `u32`, found `usize`
   |     |
   |     arguments to this function are incorrect
   |
note: function defined here
  --> $DIR/len.rs:6:4
   |
LL | fn test(length: u32) {
   |    ^^^^ -----------
help: you can convert a `usize` to a `u32` and panic if the converted value doesn't fit
   |
LL |     test(array.len().try_into().unwrap());
   |                     ++++++++++++++++++++

error: aborting due to 1 previous error

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