diff: fix missing interface import bugs

[Fergus Henderson]

profiler/call_graph.m:
profiler/read.m:
extras/trailed_update/var.m:
	Fix some "missing interface import" bugs detected by the
	latest version of the compiler.

cvs diff  extras/trailed_update/var.m profiler/call_graph.m profiler/read.m
Index: extras/trailed_update/var.m
===================================================================
RCS file: /home/mercury1/repository/mercury/extras/trailed_update/var.m,v
retrieving revision 1.11
diff -u -r1.11 var.m
--- var.m	1998/02/15 21:48:28	1.11
+++ var.m	1998/03/04 19:56:59
@@ -27,7 +27,7 @@
 %-----------------------------------------------------------------------------%
 :- module var.
 :- interface.
-:- import_module io.
+:- import_module io, std_util.
 
 	% A `var(T)' is a Prolog-style variable that holds a value of type T.
 :- type var(T).
@@ -133,7 +133,7 @@
 %-----------------------------------------------------------------------------%
 :- implementation.
 %-----------------------------------------------------------------------------%
-:- import_module std_util, bool.
+:- import_module bool.
 :- import_module unsafe, io.
 :- import_module require.
 
Index: profiler/call_graph.m
===================================================================
RCS file: /home/mercury1/repository/mercury/profiler/call_graph.m,v
retrieving revision 1.7
diff -u -r1.7 call_graph.m
--- call_graph.m	1997/07/27 15:07:44	1.7
+++ call_graph.m	1998/03/04 19:52:56
@@ -22,7 +22,7 @@
 
 :- interface.
 
-:- import_module relation, io.
+:- import_module relation, io, list, string.
 
 :- pred call_graph__main(list(string), relation(string), relation(string),
 							io__state, io__state).
@@ -35,7 +35,7 @@
 
 :- import_module read.
 :- import_module options, globals.
-:- import_module list, require, bool, std_util.
+:- import_module require, bool, std_util.
 
 
 call_graph__main(Args, StaticCallGraph0, StaticCallGraph) -->
Index: profiler/read.m
===================================================================
RCS file: /home/mercury1/repository/mercury/profiler/read.m,v
retrieving revision 1.8
diff -u -r1.8 read.m
--- read.m	1997/12/05 15:55:58	1.8
+++ read.m	1998/03/04 19:54:05
@@ -18,7 +18,7 @@
 
 :- interface.
 
-:- import_module int, io.
+:- import_module int, io, std_util, string.
 :- import_module globals.
 
 :- pred maybe_read_label_addr(maybe(int), io__state, io__state).
@@ -50,8 +50,8 @@
 
 :- implementation.
 
-:- import_module list, string, char.
-:- import_module std_util, require.
+:- import_module list, char.
+:- import_module require.
 
 :- import_module demangle.
 
-- 
Fergus Henderson <fjh at cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3         |     -- the last words of T. S. Garp.