viirya opened a new issue, #217:
URL: https://github.com/apache/arrow-rs-object-store/issues/217

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   There are some clippy errors after updating rust toolchain, e.g.:
   
   ```
   error: parameter is only used in recursion
      --> arrow-schema/src/field.rs:208:24
       |
   208 |     fn _fields<'a>(&'a self, dt: &'a DataType) -> Vec<&Field> {
       |                        ^^^^
       |
       = note: `-D clippy::only-used-in-recursion` implied by `-D warnings`
   note: parameter used here
      --> arrow-schema/src/field.rs:217:53
       |
   217 |             DataType::Dictionary(_, value_field) => 
self._fields(value_field.as_ref()),
       |                                                     ^^^^
       = help: for further information visit 
https://rust-lang.github.io/rust-clippy/master/index.html#only_used_in_recursion
   ```
   
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