add nil value

2 files changed, 4 insertions, 1 deletions

diff --git a/dbg.d b/dbg.d
index 19e92b1..e6ec197 100644
--- a/dbg.d
+++ b/dbg.d
@@ -82,6 +82,8 @@ string printableValue(Value val) {
             return printableFunction(val.as.obj);
         case ValueType.TYPE:
             return val.as.type;
+        case ValueType.NIL:
+            return "nil";
         default:
             return "! unknown value type !";
     }
diff --git a/vm.d b/vm.d
index 6fc6df7..ff2eb1d 100644
--- a/vm.d
+++ b/vm.d
@@ -223,7 +223,6 @@ class VM {
 
     InterpretResult run() {
         writeln("== VM running ==");
-        writefln("> > > framecount: %d", this.frameCount);
         while (true) {
             if (DEBUG) {
                 writeln("          Stacks:");
@@ -264,6 +263,8 @@ class VM {
                     }
                     Value val = this.popA();
                     this.globals[asString(name)] = val;
+                    Value nil = { ValueType.NIL };
+                    this.pushA(nil);
                     break;
                 case OpCode.OP_GET_GLOBAL:
                     Value name = this.current.func.chunk.constants[this.readByte()];