[m-rev.] diff: add_new_prefix

[Zoltan Somogyi]

compiler/prog_type.m:
	Replace a predicate with two modes with two single-mode predicates,
	since calling the reverse mode required misleading code.

compiler/hlds_out_goal.m:
compiler/post_typecheck.m:
	Conform to the above change.

Zoltan.

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Index: compiler/hlds_out_goal.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/hlds_out_goal.m,v
retrieving revision 1.15
diff -u -b -r1.15 hlds_out_goal.m
--- compiler/hlds_out_goal.m	27 Mar 2012 23:21:27 -0000	1.15
+++ compiler/hlds_out_goal.m	11 Apr 2012 07:15:01 -0000
@@ -921,7 +921,7 @@
             IsExistConstruct = yes,
             ConsId0 = cons(SymName0, Arity, TypeCtor)
         ->
-            remove_new_prefix(SymName, SymName0),
+            add_new_prefix(SymName0, SymName),
             ConsId = cons(SymName, Arity, TypeCtor)
         ;
             ConsId = ConsId0
@@ -1036,7 +1036,7 @@
             IsExistConstruct = yes,
             ConsId0 = cons(SymName0, Arity, TypeCtor)
         ->
-            remove_new_prefix(SymName, SymName0),
+            add_new_prefix(SymName0, SymName),
             ConsId = cons(SymName, Arity, TypeCtor)
         ;
             ConsId = ConsId0
Index: compiler/post_typecheck.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/post_typecheck.m,v
retrieving revision 1.155
diff -u -b -r1.155 post_typecheck.m
--- compiler/post_typecheck.m	13 Feb 2012 00:11:44 -0000	1.155
+++ compiler/post_typecheck.m	11 Apr 2012 07:12:40 -0000
@@ -1380,7 +1380,7 @@
     ;
         ExistQVars = [_ | _],
         ( ConsId0 = cons(ConsName0, ConsArity, TypeCtor) ->
-            remove_new_prefix(ConsName, ConsName0),
+            add_new_prefix(ConsName0, ConsName),
             ConsId = cons(ConsName, ConsArity, TypeCtor)
         ;
             unexpected($module, $pred, "invalid cons_id")
Index: compiler/prog_type.m
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/compiler/prog_type.m,v
retrieving revision 1.58
diff -u -b -r1.58 prog_type.m
--- compiler/prog_type.m	13 Feb 2012 00:11:46 -0000	1.58
+++ compiler/prog_type.m	11 Apr 2012 07:17:21 -0000
@@ -262,16 +262,18 @@
 :- func remove_typeinfo_vars_from_set_of_var(vartypes, set_of_progvar)
     = set_of_progvar.
 
-    % In the forwards mode, this predicate checks for a "new " prefix
-    % at the start of the functor name, and removes it if present;
-    % it fails if there is no such prefix.
-    % In the reverse mode, this predicate prepends such a prefix.
+    % Check for a "new " prefix at the start of the functor name,
+    % and remove it if present; if there is no such prefix, fail.
     % (These prefixes are used for construction unifications
     % with existentially typed functors.)
     %
-:- pred remove_new_prefix(sym_name, sym_name).
-:- mode remove_new_prefix(in, out) is semidet.
-:- mode remove_new_prefix(out, in) is det.
+:- pred remove_new_prefix(sym_name::in, sym_name::out) is semidet.
+
+    % Prepend a "new " prefix at the start of the given functor name.
+    % (These prefixes are used for construction unifications
+    % with existentially typed functors.)
+    %
+:- pred add_new_prefix(sym_name::in, sym_name::out) is det.
 
 :- type type_ctor_category
     --->    ctor_cat_builtin(type_ctor_cat_builtin)
@@ -882,6 +884,13 @@
 remove_new_prefix(qualified(Module, Name0), qualified(Module, Name)) :-
     string.append("new ", Name, Name0).
 
+add_new_prefix(unqualified(Name0), unqualified(Name)) :-
+    string.append("new ", Name0, Name).
+add_new_prefix(qualified(Module, Name0), qualified(Module, Name)) :-
+    string.append("new ", Name0, Name).
+
+%-----------------------------------------------------------------------------%
+
 %-----------------------------------------------------------------------------%
 
     % Given a constant and an arity, return a type_ctor.
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