diff options
| -rw-r--r-- | src/doc/reference.md | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/doc/reference.md b/src/doc/reference.md index c2b22ef3e72..a94609a8b0c 100644 --- a/src/doc/reference.md +++ b/src/doc/reference.md @@ -379,6 +379,10 @@ Examples of integer literals of various forms: 0usize; // type usize ``` +Note that the Rust syntax considers `-1i8` as an application of the [unary minus +operator](#unary-operator-expressions) to an integer literal `1i8`, rather than +a single integer literal. + ##### Floating-point literals A _floating-point literal_ has one of two forms: @@ -2776,7 +2780,9 @@ Rust defines the following unary operators. They are all written as prefix opera before the expression they apply to. * `-` - : Negation. May only be applied to numeric types. + : Negation. Signed integer types and floating-point types support negation. It + is an error to apply negation to unsigned types; for example, the compiler + rejects `-1u32`. * `*` : Dereference. When applied to a [pointer](#pointer-types) it denotes the pointed-to location. For pointers to mutable locations, the resulting |