fix switch on value

src/main.zig

@@ -29,14 +29,15 @@ pub fn main() anyerror!void {
     _ = try file.read(slice);
 
     //switch (try run(allocator, slice)) {
-    switch (run(allocator, slice)) {
-        .Ok => {},
+    const result = run(allocator, slice);
+    switch (result) {
+        .Ok => std.os.exit(0),
 
         .TokenizeError,
         .ParseError,
         .CompileError,
-        => |res| {
-            std.debug.warn("error: {}\n", res);
+        => {
+            std.debug.warn("error: {}\n", result);
             std.os.exit(1);
         },
     }