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I remembered this about Rust

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3
docs/trailing-commas-in-calls.md
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@ -88,7 +88,8 @@ function f(
```
Trailing comma is not allowed after `...` as it is never correct to put more arguments after the ellipsis. This is consistent with:
- JavaScript - Supports `function f(a, b,)`, but `function f(...a,) {}` results in "Rest parameter must be last formal parameter".
- JavaScript supports `function f(a, b,)`, but `function f(...a,) {}` results in "Rest parameter must be last formal parameter".
- Rust supports `Struct { a, ..Default::default() }`, but not `Struct { a, ..Default::default(), }`
Though this is not universally agreed upon:
- Rust's unstable C variadics support `unsafe extern "C" fn f(a: u32, ...,) {}`, though this syntax is not finalized.