jhorstmann commented on a change in pull request #714:
URL: https://github.com/apache/arrow-rs/pull/714#discussion_r696837777



##########
File path: arrow/src/alloc/types.rs
##########
@@ -36,7 +36,7 @@ pub unsafe trait NativeType:
 }
 
 macro_rules! create_native {
-    ($native_ty:ty,$($impl_pattern:pat)|+) => {
+    ($native_ty:ty,$($impl_pattern:pat_param)|+) => {

Review comment:
       @alamb Either I have something misconfigured locally or this change 
breaks compilation with the version 1.52.1 configured in rust-toolchain:
   ```
   error: invalid fragment specifier `pat_param`
     --> arrow/src/alloc/types.rs:39:22
      |
   39 |     ($native_ty:ty,$($impl_pattern:pat_param)|+) => {
      |                      ^^^^^^^^^^^^^^^^^^^^^^^
      |
      = help: valid fragment specifiers are `ident`, `block`, `stmt`, `expr`, 
`pat`, `ty`, `lifetime`, `literal`, `path`, `meta`, `tt`, `item` and `vis`
   ```




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