Macros

• Macros are inlined each time they are called.
• Macros can have untyped parameters.
• Macros are allowed to use var to infer the type of any variable.
• Macros must start with @ when they use expression parameters.
• Expression parameters start with a # and copy the passed expression every time they are used, similar to C macro parameters except the expression must be valid before it is copied.

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