Document special "this" module name for PackageImports extension

Migrated from http://comments.gmane.org/gmane.comp.lang.haskell.glasgow.user/22794:

I just found out that in combination with the PackageImports extension there's a special module name "this" which according to (1.) always refers to the current package. But I couldn't find this rather useful feature mentioned in the GHC 7.6.1 Manual PackageImports section(2.).

A simple addition to the documentation such as the example below would be helpful:

diff --git a/docs/users_guide/glasgow_exts.xml b/docs/users_guide/glasgow_exts.xml
index 541b309..5508c23 100644
--- a/docs/users_guide/glasgow_exts.xml
+++ b/docs/users_guide/glasgow_exts.xml
@@ -1999,6 +1999,9 @@ import "network" Network.Socket
     available from multiple packages, or is present in both the
     current package being built and an external package.</para>
 
+  <para>The special package name <literal>this</literal> can be used to
+    refer to the current package being built.</para>
+
   <para>Note: you probably don't need to use this feature, it was
     added mainly so that we can build backwards-compatible versions of
     packages when APIs change.  It can lead to fragile dependencies in

1. https://github.com/ghc/ghc/commit/436a5fdbe0c9a466569abf1d501a6018aaa3e49e
2. http://www.haskell.org/ghc/docs/latest/html/users_guide/syntax-extns.html#package-imports

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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