Auto merge of #31664 - nodakai:reference-negation, r=steveklabnik
It would be great if someone could check my English.
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@ -379,6 +379,10 @@ Examples of integer literals of various forms:
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0usize; // type usize
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```
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Note that the Rust syntax considers `-1i8` as an application of the [unary minus
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operator](#unary-operator-expressions) to an integer literal `1i8`, rather than
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a single integer literal.
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##### Floating-point literals
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A _floating-point literal_ has one of two forms:
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@ -2776,7 +2780,9 @@ Rust defines the following unary operators. They are all written as prefix opera
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before the expression they apply to.
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* `-`
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: Negation. May only be applied to numeric types.
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: Negation. Signed integer types and floating-point types support negation. It
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is an error to apply negation to unsigned types; for example, the compiler
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rejects `-1u32`.
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* `*`
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: Dereference. When applied to a [pointer](#pointer-types) it denotes the
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pointed-to location. For pointers to mutable locations, the resulting
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