Crates and source files

Author: frewsxcv

src/doc/reference/src/crates-and-source-files.md

@@ -13,24 +13,16 @@ semantic rules
 that have a *dynamic interpretation* govern the behavior of the program at
 run-time.
 
-[^phase-distinction]: This distinction would also exist in an interpreter.
-    Static checks like syntactic analysis, type checking, and lints should
-    happen before the program is executed regardless of when it is executed.
-
 The compilation model centers on artifacts called _crates_. Each compilation
 processes a single crate in source form, and if successful, produces a single
 crate in binary form: either an executable or some sort of
 library.[^cratesourcefile]
 
-[^cratesourcefile]: A crate is somewhat analogous to an *assembly* in the
-    ECMA-335 CLI model, a *library* in the SML/NJ Compilation Manager, a *unit*
-    in the Owens and Flatt module system, or a *configuration* in Mesa.
-
 A _crate_ is a unit of compilation and linking, as well as versioning,
 distribution and runtime loading. A crate contains a _tree_ of nested
-[module](#modules) scopes. The top level of this tree is a module that is
+[module] scopes. The top level of this tree is a module that is
 anonymous (from the point of view of paths within the module) and any item
-within a crate has a canonical [module path](#paths) denoting its location
+within a crate has a canonical [module path] denoting its location
 within the crate's module tree.
 
 The Rust compiler is always invoked with a single source file as input, and
@@ -42,16 +34,16 @@ A Rust source file describes a module, the name and location of which —
 in the module tree of the current crate — are defined from outside the
 source file: either by an explicit `mod_item` in a referencing source file, or
 by the name of the crate itself. Every source file is a module, but not every
-module needs its own source file: [module definitions](#modules) can be nested
+module needs its own source file: [module definitions][module] can be nested
 within one file.
 
 Each source file contains a sequence of zero or more `item` definitions, and
-may optionally begin with any number of [attributes](#items-and-attributes)
+may optionally begin with any number of [attributes]
 that apply to the containing module, most of which influence the behavior of
 the compiler. The anonymous crate module can have additional attributes that
 apply to the crate as a whole.
 
-```no_run
+```rust,no_run
 // Specify the crate name.
 #![crate_name = "projx"]
 
@@ -65,4 +57,17 @@ apply to the crate as a whole.
 
 A crate that contains a `main` function can be compiled to an executable. If a
 `main` function is present, its return type must be `()`
-("[unit](#tuple-types)") and it must take no arguments.
+("[unit]") and it must take no arguments.
+
+[^phase-distinction]: This distinction would also exist in an interpreter.
+    Static checks like syntactic analysis, type checking, and lints should
+    happen before the program is executed regardless of when it is executed.
+
+[^cratesourcefile]: A crate is somewhat analogous to an *assembly* in the
+    ECMA-335 CLI model, a *library* in the SML/NJ Compilation Manager, a *unit*
+    in the Owens and Flatt module system, or a *configuration* in Mesa.
+
+[module]: items.html#modules
+[module path]: paths.html
+[attributes]: items-and-attributes.html
+[unit]: types.html#tuple-types