Merge pull request rust-lang#426 from ehuss/grammar-items

Grammar: Add definition of "Item".

Author: Havvy

src/items.md

@@ -1,31 +1,49 @@
 # Items
 
+> **<sup>Syntax:<sup>**\
+> _Item_:\
+> &nbsp;&nbsp; [_OuterAttribute_]<sup>\*</sup> [_Visibility_]<sup>?</sup>\
+> &nbsp;&nbsp; (\
+> &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;  [_Module_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_ExternCrate_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_UseDeclaration_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_Function_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_TypeAlias_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_Struct_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_Enumeration_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_Union_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_ConstantItem_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_StaticItem_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_Trait_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_Implementation_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | [_ExternBlock_]\
+> &nbsp;&nbsp; &nbsp;&nbsp; | _Macro_\
+> &nbsp;&nbsp; &nbsp;&nbsp; | _MacroDefinition_\
+> &nbsp;&nbsp; )
+
 An _item_ is a component of a crate. Items are organized within a crate by a
 nested set of [modules]. Every crate has a single "outermost" anonymous module;
 all further items within the crate have [paths] within the module tree of the
 crate.
 
-[modules]: items/modules.html
-[paths]: paths.html
-
 Items are entirely determined at compile-time, generally remain fixed during
 execution, and may reside in read-only memory.
 
 There are several kinds of items:
 
-* [modules](items/modules.html)
-* [`extern crate` declarations](items/extern-crates.html)
-* [`use` declarations](items/use-declarations.html)
-* [function definitions](items/functions.html)
-* [type definitions](items/type-aliases.html)
-* [struct definitions](items/structs.html)
-* [enumeration definitions](items/enumerations.html)
-* [union definitions](items/unions.html)
-* [constant items](items/constant-items.html)
-* [static items](items/static-items.html)
-* [trait definitions](items/traits.html)
-* [implementations](items/implementations.html)
-* [`extern` blocks](items/external-blocks.html)
+* [modules]
+* [`extern crate` declarations]
+* [`use` declarations]
+* [function definitions]
+* [type definitions]
+* [struct definitions]
+* [enumeration definitions]
+* [union definitions]
+* [constant items]
+* [static items]
+* [trait definitions]
+* [implementations]
+* [`extern` blocks]
 
 Some items form an implicit scope for the declaration of sub-items. In other
 words, within a function or module, declarations of items can (in many cases)
@@ -36,3 +54,33 @@ as if the item was declared outside the scope &mdash; it is still a static item
 qualified by the name of the enclosing item, or is private to the enclosing
 item (in the case of functions). The grammar specifies the exact locations in
 which sub-item declarations may appear.
+
+[_ConstantItem_]: items/constant-items.html
+[_Enumeration_]: items/enumerations.html
+[_ExternBlock_]: items/external-blocks.html
+[_ExternCrate_]: items/extern-crates.html
+[_Function_]: items/functions.html
+[_Implementation_]: items/implementations.html
+[_Module_]: items/modules.html
+[_OuterAttribute_]: attributes.html
+[_StaticItem_]: items/static-items.html
+[_Struct_]: items/structs.html
+[_Trait_]: items/traits.html
+[_TypeAlias_]: items/type-aliases.html
+[_Union_]: items/unions.html
+[_UseDeclaration_]: items/use-declarations.html
+[_Visibility_]: visibility-and-privacy.html
+[`extern crate` declarations]: items/extern-crates.html
+[`extern` blocks]: items/external-blocks.html
+[`use` declarations]: items/use-declarations.html
+[constant items]: items/constant-items.html
+[enumeration definitions]: items/enumerations.html
+[function definitions]: items/functions.html
+[implementations]: items/implementations.html
+[modules]: items/modules.html
+[paths]: paths.html
+[static items]: items/static-items.html
+[struct definitions]: items/structs.html
+[trait definitions]: items/traits.html
+[type definitions]: items/type-aliases.html
+[union definitions]: items/unions.html