diff --git a/tool/playground/ABaseVisitor.java b/tool/playground/ABaseVisitor.java
deleted file mode 100644
index 355023fd6..000000000
--- a/tool/playground/ABaseVisitor.java
+++ /dev/null
@@ -1,10 +0,0 @@
-import org.antlr.v4.runtime.tree.ParseTreeVisitor;
-
-public class ABaseVisitor<T> extends ParseTreeVisitor<T> implements AVisitor<T> {
-	public T visit(AParser.MultContext ctx) { visitChildren(ctx); return null; }
-	public T visit(AParser.ParensContext ctx) { visitChildren(ctx); return null; }
-	public T visit(AParser.sContext ctx) { visitChildren(ctx); return null; }
-	public T visit(AParser.FooContext ctx) { visitChildren(ctx); return null; }
-	public T visit(AParser.AddContext ctx) { visitChildren(ctx); return null; }
-	public T visit(AParser.IntContext ctx) { visitChildren(ctx); return null; }
-}