guide: Stub out some more of the overall guide outline

guide/go.rst

@@ -24,5 +24,8 @@ a Go program.
    go_diagnostics
    go_decoding_gohcl
    go_decoding_hcldec
+   go_expression_eval
+   go_decoding_lowlevel
+   go_patterns
 
 .. _Go: https://golang.org/

guide/go_decoding_gohcl.rst

@@ -67,7 +67,7 @@ The second argument to ``gohcl.DecodeBody``, shown as ``nil`` in the previous
 example, allows the calling application to additionally offer variables and
 functions for use in expressions. Its value is a pointer to an
 ``hcl.EvalContext``, which will be covered in more detail in the later section
-:ref:`expression-eval`. For now, a simple example of making the id of the
+:ref:`go-expression-eval`. For now, a simple example of making the id of the
 current process available as a single variable called ``pid``:
 
 .. code-block:: go

guide/go_decoding_hcldec.rst

@@ -223,7 +223,7 @@ just as with ``gohcl.DecodeBlock``.
 This object can be constructed using
 :ref:`the gohcl helper function <go-decoding-gohcl-evalcontext>` as before if desired, but
 you can also choose to work directly with :go:type:`hcl.EvalContext` as
-discussed in :ref:`expression-eval`:
+discussed in :ref:`go-expression-eval`:
 
 .. code-block:: go
 

guide/go_decoding_lowlevel.rst

@@ -0,0 +1,5 @@
+.. _go-decoding-lowlevel:
+
+Advanced Decoding With The Low-level API
+========================================
+

guide/go_expression_eval.rst

@@ -0,0 +1,5 @@
+.. _go-expression-eval:
+
+Expression Evaluation
+=====================
+

guide/go_patterns.rst

@@ -0,0 +1,2 @@
+Design Patterns for Complex Systems
+===================================

guide/index.rst

@@ -28,6 +28,7 @@ via its library API.
 
    intro
    go
+   language_design
 
 .. _libucl: https://github.com/vstakhov/libucl
 .. _`nginx configuration`: http://nginx.org/en/docs/beginners_guide.html#conf_structure

guide/language_design.rst

@@ -0,0 +1,3 @@
+Configuration Language Design
+=============================
+