playground: fix test by replacing bs.deriving with deriving

test/blackbox-tests/playground.t

@@ -15,13 +15,13 @@ Prepare an input file to test some snippets to exercise common functionality
   > console.log(ocaml.compile(\`let john = [%bs.obj { name = "john"; age = 99 }] let t = john##name\`));
   > console.log(ocaml.compile(\`let foo = Belt.List.map\`));
   > console.log(ocaml.compile(\`let +foo\`));
-  > console.log(ocaml.compile(\`let foo = "fpp" + 2\`));
+  > console.log(ocaml.compile(\`let foo = "" + 2\`));
   > console.log(ocaml.compile(\`type person = {
   >   name: string ;
   >   age: int
-  > }[@@bs.deriving abstract]
+  > }[@@deriving abstract]
   > 
-  > let person1 = person ~name:"joe" ~last:"bar" ~age:10\`));
+  > let person1: person = person ~name:"joe" ~age:10\`));
   > EOF
 
   $ node input.js
@@ -77,21 +77,20 @@ Prepare an input file to test some snippets to exercise common functionality
     row: 0,
     column: 10,
     endRow: 0,
-    endColumn: 15,
+    endColumn: 12,
     text: 'This expression has type string but an expression was expected of type int',
     type: 'error'
   }
-  File "_none_", line 4, characters 4-15:
-  Alert unused: Unused attribute [@bs.deriving]
-  This means such annotation is not annotated properly.
-  For example, some annotations are only meaningful in externals
-  
   {
-    js_error_msg: 'Line 6, 14:\n  Error Unbound value person',
-    row: 5,
-    column: 14,
-    endRow: 5,
-    endColumn: 20,
-    text: 'Unbound value person',
-    type: 'error'
+    js_code: '// Generated by Melange\n' +
+      "'use strict';\n" +
+      '\n' +
+      '\n' +
+      'var person1 = {\n' +
+      '  name: "joe",\n' +
+      '  age: 10\n' +
+      '};\n' +
+      '\n' +
+      'exports.person1 = person1;\n' +
+      '/* No side effect */\n'
   }