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Add definition of a fat pointer 

Definition referenced from Programming Rust by Jim Blandy & Jason
Orendorff, published by O'Reilly. Page 214: References to Slices
and Trait Objects.
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Samuel Wilson 2018-04-07 00:01:51 +12:00 committed by Who? Me?!
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@ -16,6 +16,7 @@ cx | we tend to use "cx" as an abbrevation for context. Se
DAG | a directed acyclic graph is used during compilation to keep track of dependencies between queries. ([see more](incremental-compilation.html))
data-flow analysis | a static analysis that figures out what properties are true at each point in the control-flow of a program; see [the background chapter for more](./appendix-background.html#dataflow)
DefId | an index identifying a definition (see `librustc/hir/def_id.rs`). Uniquely identifies a `DefPath`.
Fat pointer | a two word value carrying the address of some value, along with some further information necessary to put the value to use. For example: a reference to a slice is a fat pointer, carrying the starting address of the slice and its length.
free variable | a "free variable" is one that is not bound within an expression or term; see [the background chapter for more](./appendix-background.html#free-vs-bound)
'gcx | the lifetime of the global arena ([see more](ty.html))
generics | the set of generic type parameters defined on a type or item