3 files changed, 11 insertions, 1 deletions
diff --git a/scope.c b/scope.c
index eca78cd..f093b82 100644
--- a/scope.c
+++ b/scope.c
@@ -5,6 +5,7 @@
 
 #include "node.h"
 #include "scope.h"
+#include "pc.h"
 
 scope* mkscope()
 {
diff --git a/sem_check.c b/sem_check.c
index d174bf8..7e6e338 100644
--- a/sem_check.c
+++ b/sem_check.c
@@ -123,13 +123,20 @@ ptree *t;
 		if (type == ARRAY - INT || type == ARRAY - REAL)
 			return ARRAY - type;
 		break;
+	case IF:
+		if (!(t->r && t->l))
+			yyerror("Incomplete parse tree\n");
+
+		if (t->l->ret_type != BOOL)
+			yyerror("If condition must be of type BOOL\n");
+		return 0;
+
 	default:
 		return -200;
 		snprintf(buf, 101, "Unknown tree node: %d...\n", t->type);
 		yyerror(buf);
 	}
 
-
 	return -1;
 
 }
diff --git a/tree.c b/tree.c
index ee4bb8e..de9a0f5 100644
--- a/tree.c
+++ b/tree.c
@@ -5,6 +5,8 @@
 
 #include "node.h"
 #include "tree.h"
+#include "scope.h"
+#include "sem_check.h"
 #include "y.tab.h"
 #include "pc.h"