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Auto merge of #30807 - kolloch:patch-1, r=steveklabnik

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When I read the book, the following sentence of the reference documentation helped me greatly to understand slices:

"Slices are a view into a block of memory represented as a pointer and a length."

In this commit, I tried to integrate the gist of that into the slice section inside of "primitive-types.md". I am not a native speaker, so feel very free to improve the wording.

r? @steveklabnik
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bors 2016-01-23 07:44:17 +00:00
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@ -164,6 +164,9 @@ copying. For example, you might want to reference only one line of a file read
into memory. By nature, a slice is not created directly, but from an existing
variable binding. Slices have a defined length, can be mutable or immutable.
Internally, slices are represented as a pointer to the beginning of the data
and a length.
## Slicing syntax
You can use a combo of `&` and `[]` to create a slice from various things. The