codephage2020 commented on PR #9498:
URL: https://github.com/apache/arrow-rs/pull/9498#issuecomment-3988226113
CC @scovich @klion26
I've reproduced the scenario and identified the cause: Rust does not check
for duplicate macros, only for unused ones. The following example, which is
identical to the original code, does not trigger an error.
```rust
fn main() {
macro_rules! my_macro {
() => { println!("first"); };
}
my_macro!();
macro_rules! my_macro {
() => { println!("second"); };
}
my_macro!();
}
```
output(NO WANRING)
```
first
second
```
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