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Doc: `static mut` is unsafe too 

According to the corresponding section, accessing a mutable static variable requires `unsafe` too, and I believe it counts as as language level feature. Add it to the relevant list in the Unsafety section.
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Simon Sapin 2014-05-28 14:19:25 +01:00
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@ -1036,6 +1036,7 @@ Unsafe operations are those that potentially violate the memory-safety guarantee
The following language level features cannot be used in the safe subset of Rust:
- Dereferencing a [raw pointer](#pointer-types).
- Reading or writing a [mutable static variable](#mutable-statics).
- Calling an unsafe function (including an intrinsic or foreign function).
##### Unsafe functions