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README.md: Update version-dependent features
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joshtriplett committed Jul 12, 2022
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Expand Up @@ -40,20 +40,15 @@ libc = "0.2"

* **deprecated**: `use_std` is deprecated, and is equivalent to `std`.

* **deprecated**: `align` is deprecated (and always enabled).

## Rust version support

The minimum supported Rust toolchain version is **Rust 1.13.0** . APIs requiring
The minimum supported Rust toolchain version is **Rust 1.56.0** . APIs requiring
newer Rust features are only available on newer Rust toolchains:

| Feature | Version |
|----------------------|---------|
| `union` | 1.19.0 |
| `const mem::size_of` | 1.24.0 |
| `repr(align)` | 1.25.0 |
| `extra_traits` | 1.25.0 |
| `core::ffi::c_void` | 1.30.0 |
| `repr(packed(N))` | 1.33.0 |
| `cfg(target_vendor)` | 1.33.0 |
| `const-extern-fn` | 1.62.0 |

## Platform support
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