use assert(0) instead of null reference

src/dcast.d

@@ -196,7 +196,7 @@ extern (C++) MATCH implicitConvTo(Expression e, Type t)
             {
                 printf("Expression::implicitConvTo(this=%s, type=%s, t=%s)\n", e.toChars(), e.type.toChars(), t.toChars());
             }
-            //static int nest; if (++nest == 10) halt();
+            //static int nest; if (++nest == 10) assert(0);
             if (t == Type.terror)
                 return;
             if (!e.type)

src/declaration.d

@@ -1115,7 +1115,7 @@ public:
             printf(" stc = x%x\n", sc.stc);
             printf(" storage_class = x%llx\n", storage_class);
             printf("linkage = %d\n", sc.linkage);
-            //if (strcmp(toChars(), "mul") == 0) halt();
+            //if (strcmp(toChars(), "mul") == 0) assert(0);
         }
         //    if (sem > SemanticStart)
         //      return;

src/dmangle.d

@@ -262,7 +262,7 @@ public:
         }
         // Write argument types
         paramsToDecoBuffer(t.parameters);
-        //if (buf->data[buf->offset - 1] == '@') halt();
+        //if (buf->data[buf->offset - 1] == '@') assert(0);
         buf.writeByte('Z' - t.varargs); // mark end of arg list
         if (tret !is null)
             visitWithMask(tret, 0);
@@ -805,7 +805,6 @@ public:
             debug
             {
                 printf("storageClass = x%llx\n", p.storageClass & (STCin | STCout | STCref | STClazy));
-                halt();
             }
             assert(0);
         }

src/dstruct.d

@@ -238,7 +238,7 @@ public:
     final void semantic(Scope* sc)
     {
         //printf("+StructDeclaration::semantic(this=%p, %s '%s', sizeok = %d)\n", this, parent->toChars(), toChars(), sizeok);
-        //static int count; if (++count == 20) halt();
+        //static int count; if (++count == 20) assert(0);
         if (semanticRun >= PASSsemanticdone)
             return;
         uint dprogress_save = Module.dprogress;

src/errors.d

@@ -286,8 +286,5 @@ extern (C++) void fatal()
  */
 extern (C++) void halt()
 {
-    debug
-    {
-        *cast(char*)0 = 0;
-    }
+    assert(0);
 }

src/expression.d

@@ -2576,7 +2576,7 @@ public:
             version (none)
             {
                 print();
-                halt();
+                assert(0);
             }
             if (!global.gag)
                 type = Type.terror;
@@ -5777,7 +5777,7 @@ public:
     {
         super(loc, TOKvar, __traits(classInstanceSize, VarExp), var, hasOverloads);
         //printf("VarExp(this = %p, '%s', loc = %s)\n", this, var->toChars(), loc.toChars());
-        //if (strcmp(var->ident->toChars(), "func") == 0) halt();
+        //if (strcmp(var->ident->toChars(), "func") == 0) assert(0);
         this.type = var.type;
     }
 

src/init.d

@@ -617,7 +617,7 @@ public:
     Expression toExpression(Type tx = null)
     {
         //printf("ArrayInitializer::toExpression(), dim = %d\n", dim);
-        //static int i; if (++i == 2) halt();
+        //static int i; if (++i == 2) assert(0);
         Expressions* elements;
         size_t edim;
         Type t = null;
@@ -713,7 +713,7 @@ public:
     {
         Expression e;
         //printf("ArrayInitializer::toAssocArrayInitializer()\n");
-        //static int i; if (++i == 2) halt();
+        //static int i; if (++i == 2) assert(0);
         auto keys = new Expressions();
         keys.setDim(value.dim);
         auto values = new Expressions();

src/mtype.d

@@ -7266,7 +7266,7 @@ public:
             if (s)
             {
                 s.error(loc, "is used as a type");
-                //halt();
+                //assert(0);
             }
             else
                 error(loc, "%s is used as a type", toChars());