ast: Add a var decl to the stack trace

Author: hexaredecimal

src/main/java/org/piccode/ast/ImportAst.java

@@ -131,7 +131,9 @@ private List<Ast> loadModuleFromStdLib(String module) {
 			return Context.top.getCached(path);
 		}
 
-		for (var fp : _file.listFiles()) {
+		var files = _file.listFiles();
+
+		for (var fp : files) {
 			if (fp.getName().endsWith(".pics")) {
 				var code = readFile(fp);
 				if (code == null) {

src/main/java/org/piccode/ast/VarDecl.java

@@ -25,7 +25,9 @@ public String toString() {
 
 	@Override
 	public PiccodeValue execute() {
+		Context.top.pushStackFrame(this);
 		var _value = value.execute();
+		Context.top.dropStackFrame();
 		Context.top.putLocal(name, _value);
 		return _value;
 	}