[project @ 1998-02-02 13:31:19 by simonm]

remove old section about module recursion.

ghc/docs/users_guide/debugging.vsgml

@@ -322,51 +322,3 @@ flags in your module, the OPTIONS will get put into the generated .hc
 file).
 
 %----------------------------------------------------------------------
-<sect2>How to compile mutually recursive modules
-<p>
-<nidx>module system, recursion</nidx>
-
-Currently, the compiler does not have proper support for dealing with
-mutually recursive modules:
-
-<tscreen><verb>
-module A where
-
-import B
-
-newtype A = A Int
-
-f :: B -> A
-f (B x) = A x
---------
-module B where
-
-import A
-
-data B = B !Int
-
-g :: A -> B
-g (A x) = B x
-</verb></tscreen>
-
-When compiling either module A and B, the compiler will try (in vain)
-to look for the interface file of the other. So, to get mutually
-recursive modules off the ground, you need to hand write an interface
-file for A or B, so as to break the loop. For the example at hand, the
-boot interface file for A would like the following:
-
-<tscreen><verb>
-_interface_ A 1
-_exports_
-A A(A) f;
-_declarations_
-1 newtype A = A PrelBase.Int ;
-1 f _:_ B.B -> A.A ;;
-</verb></tscreen>
-
-To make sure you get the syntax right, tailoring an existing interface
-file is a Good Idea.
-
-<bf>Note:</bf> This is all a temporary solution, a version of the
-compiler that handles mutually recursive properly without the manual
-construction of interface file, is in the works.