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manual: link to expressions in lval/rval section.

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Graydon Hoare 2012-10-11 13:11:21 -07:00
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doc/rust.md
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@ -1476,11 +1476,15 @@ Expressions are divided into two main categories: _lvalues_ and _rvalues_.
Likewise within each expression, sub-expressions may occur in _lvalue context_ or _rvalue context_.
The evaluation of an expression depends both on its own category and the context it occurs within.
Path, field and index expressions are lvalues.
[Path](#path-expressions), [field](#field-expressions) and [index](#index-expressions) expressions are lvalues.
All other expressions are rvalues.
The left operand of an assignment, compound-assignment, or binary move expression is an lvalue context,
as is the single operand of a borrow, unary copy or move expression, and _both_ operands of a swap expression.
The left operand of an [assignment](#assignment-expressions) or
[compound-assignment](#compound-assignment-expressions) expression is an lvalue context,
as is the single operand of a unary [borrow](#unary-operator-expressions),
or [move](#unary-move-expressions) expression,
and _both_ operands of a [swap](#swap-expressions)
or [binary move](#binary-move-expressions) expression.
All other expression contexts are rvalue contexts.
When an lvalue is evaluated in an _lvalue context_, it denotes a memory location;