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yaml --- r: 134703 b: refs/heads/try c: 64813d3 h: refs/heads/master i: 134701: b13d986 134699: 5469dd6 134695: bef3164 134687: 69a8cec v: v3
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[refs]

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branches/try/src/doc/reference.md

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array_elems : [expr [',' expr]*] | [expr ',' ".." expr] ;
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```
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An [array](#vector,-array,-and-slice-types) _expression_ is written by
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enclosing zero or more comma-separated expressions of uniform type in square
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brackets.
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An [array](#array,-and-slice-types) _expression_ is written by enclosing zero
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or more comma-separated expressions of uniform type in square brackets.
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In the `[expr ',' ".." expr]` form, the expression after the `".."` must be a
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constant expression that can be evaluated at compile time, such as a
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idx_expr : expr '[' expr ']' ;
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```
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[Array](#vector,-array,-and-slice-types)-typed expressions can be indexed by
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[Array](#array,-and-slice-types)-typed expressions can be indexed by
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writing a square-bracket-enclosed expression (the index) after them. When the
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array is mutable, the resulting [lvalue](#lvalues,-rvalues-and-temporaries) can
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be assigned to.
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assert!(b != "world");
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```
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### Vector, Array, and Slice types
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### Array, and Slice types
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Rust has three different types for a list of items:
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Rust has two different types for a list of items:
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* `Vec<T>`, a 'vector'
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* `[T ..N]`, an 'array'
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* `&[T]`, a 'slice'.
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A vector is a heap-allocated list of `T`. A vector has ownership over the data
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inside of it. It is also able to grow and change in size. It's important to
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note that `Vec<T>` is a library type, it's not actually part of the core
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language.
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An array has a fixed size, and can be allocated on either the stack or the
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heap.
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A slice is a 'view' into a vector or array. It doesn't own the data it points
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A slice is a 'view' into an array. It doesn't own the data it points
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to, it borrows it.
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An example of each kind:
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As you can see, the `vec!` macro allows you to create a `Vec<T>` easily. The
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`vec!` macro is also part of the standard library, rather than the language.
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All in-bounds elements of vectors, arrays, and slices are always initialized,
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and access to a vector, array, or slice is always bounds-checked.
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All in-bounds elements of arrays, and slices are always initialized, and access
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to an array or slice is always bounds-checked.
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### Structure types
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* Recursive types must include a nominal type in the recursion
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(not mere [type definitions](#type-definitions),
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or other structural types such as [arrays](#vector,-array,-and-slice-types) or [tuples](#tuple-types)).
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or other structural types such as [arrays](#array,-and-slice-types) or [tuples](#tuple-types)).
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* A recursive `enum` item must have at least one non-recursive constructor
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(in order to give the recursion a basis case).
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* The size of a recursive type must be finite;

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