Start a new line before the closing bracket of a commented array

tests/test_items.py

@@ -529,6 +529,35 @@ def test_array_add_line() -> None:
     )
 
 
+def test_array_add_line_trailing_comment_does_not_hide_bracket() -> None:
+    t = api.array()
+    t.add_line("foo", comment="bar")
+
+    assert (
+        t.as_string()
+        == """[
+    "foo", # bar
+]"""
+    )
+
+    doc = api.document()
+    doc.add("array", t)
+    assert parse(doc.as_string())["array"] == ["foo"]
+
+
+def test_array_add_line_trailing_comment_closing_line_is_not_doubled() -> None:
+    t = api.array()
+    t.add_line("foo", comment="bar")
+    t.add_line(indent="")
+
+    assert (
+        t.as_string()
+        == """[
+    "foo", # bar
+]"""
+    )
+
+
 def test_array_add_line_multiline_comment_is_rejected() -> None:
     t = api.array()
     with pytest.raises(ValueError, match="line breaks"):

tomlkit/items.py

@@ -1464,7 +1464,13 @@ def multiline(self, multiline: bool) -> Array:
 
     def as_string(self) -> str:
         if not self._multiline or not self._value:
-            return f"[{''.join(v.as_string() for v in self._iter_items())}]"
+            items = list(self._iter_items())
+            body = "".join(v.as_string() for v in items)
+            if items and isinstance(items[-1], Comment):
+                # A comment runs to the end of the line, so the closing bracket
+                # has to start a new one or it would be commented out.
+                body += "\n" + self.trivia.indent
+            return f"[{body}]"
 
         s = "[\n"
         s += "".join(