diff -r a745f7d38a5d -r e8de43eefcc5 stage3/narrow_candidate_datatypes.cc
--- a/stage3/narrow_candidate_datatypes.cc	Sun Feb 12 20:43:49 2012 +0100
+++ b/stage3/narrow_candidate_datatypes.cc	Mon Feb 13 16:29:55 2012 +0000
@@ -382,12 +382,13 @@
 // SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
 void *narrow_candidate_datatypes_c::visit(il_function_call_c *symbol) {
 	generic_function_call_t fcall_param = {
-	/* fcall_param.function_name               = */ symbol->function_name,
-	/* fcall_param.nonformal_operand_list      = */ symbol->il_operand_list,
-	/* fcall_param.formal_operand_list         = */ NULL,
-	/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
-	/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
-	/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
+		/* fcall_param.function_name               = */ symbol->function_name,
+		/* fcall_param.nonformal_operand_list      = */ symbol->il_operand_list,
+		/* fcall_param.formal_operand_list         = */ NULL,
+		/* enum {POU_FB, POU_function} POU_type    = */ generic_function_call_t::POU_function,
+		/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
+		/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
+		/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
 	};
 
 	/* The first parameter of a non formal function call in IL will be the 'current value' (i.e. the prev_il_instruction)
@@ -453,12 +454,13 @@
 // SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
 void *narrow_candidate_datatypes_c::visit(il_formal_funct_call_c *symbol) {
 	generic_function_call_t fcall_param = {
-	/* fcall_param.function_name               = */ symbol->function_name,
-	/* fcall_param.nonformal_operand_list      = */ NULL,
-	/* fcall_param.formal_operand_list         = */ symbol->il_param_list,
-	/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
-	/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
-	/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
+		/* fcall_param.function_name               = */ symbol->function_name,
+		/* fcall_param.nonformal_operand_list      = */ NULL,
+		/* fcall_param.formal_operand_list         = */ symbol->il_param_list,
+		/* enum {POU_FB, POU_function} POU_type    = */ generic_function_call_t::POU_function,
+		/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
+		/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
+		/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
 	};
   
 	narrow_function_invocation(symbol, fcall_param);
@@ -1143,12 +1145,13 @@
 // SYM_REF3(function_invocation_c, function_name, formal_param_list, nonformal_param_list, symbol_c *called_function_declaration; int extensible_param_count; std::vector <symbol_c *> candidate_functions;)
 void *narrow_candidate_datatypes_c::visit(function_invocation_c *symbol) {
 	generic_function_call_t fcall_param = {
-	/* fcall_param.function_name               = */ symbol->function_name,
-	/* fcall_param.nonformal_operand_list      = */ symbol->nonformal_param_list,
-	/* fcall_param.formal_operand_list         = */ symbol->formal_param_list,
-	/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
-	/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
-	/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
+		/* fcall_param.function_name               = */ symbol->function_name,
+		/* fcall_param.nonformal_operand_list      = */ symbol->nonformal_param_list,
+		/* fcall_param.formal_operand_list         = */ symbol->formal_param_list,
+		/* enum {POU_FB, POU_function} POU_type    = */ generic_function_call_t::POU_function,
+		/* fcall_param.candidate_functions         = */ symbol->candidate_functions,
+		/* fcall_param.called_function_declaration = */ symbol->called_function_declaration,
+		/* fcall_param.extensible_param_count      = */ symbol->extensible_param_count
 	};
   
 	narrow_function_invocation(symbol, fcall_param);