Improved thread creation on Linux

src/core/ExpressionToMemory.go

@@ -26,6 +26,11 @@ func (f *Function) ExpressionToMemory(node *expression.Expression, memory asm.Me
 				return types.AnyPointer, nil
 			}
 
+			if name == "_exit" {
+				f.MemoryLabel(asm.STORE, memory, "_exit")
+				return types.AnyPointer, nil
+			}
+
 			return nil, errors.New(&errors.UnknownIdentifier{Name: name}, f.File, node.Token.Position)
 		}
 

src/core/Fold.go

@@ -27,6 +27,23 @@ func (f *Function) Fold(expr *expression.Expression) error {
 		return nil
 	}
 
+	if expr.Token.Kind == token.Period {
+		left := expr.Children[0]
+		leftText := left.Token.Text(f.File.Bytes)
+		right := expr.Children[1]
+		rightText := right.Token.Text(f.File.Bytes)
+		constant, isConst := f.Constants[f.Package+"."+leftText+"."+rightText]
+
+		if !isConst {
+			return nil
+		}
+
+		value, err := f.ToNumber(constant.Value)
+		expr.Value = value
+		expr.IsFolded = true
+		return err
+	}
+
 	canFold := true
 
 	for _, child := range expr.Children {