fix issue #163 comment disappearing in list before flow mapping

should be fixed in 0.15.54

*When this change indeed resolves your problem, please **Close** this issue*.
*(You can do so usingthe WorkFlow pull-down (close to the top right of this page)*

3 files changed, 22 insertions, 6 deletions

diff --git a/_test/test_issues.py b/_test/test_issues.py
index 1793edb..7e95857 100644
--- a/_test/test_issues.py
+++ b/_test/test_issues.py
@@ -46,7 +46,7 @@ class TestIssues:
         """)
         for comment in ['', ' # no-newline', '  # some comment\n', '\n', ]:
             s = yaml_str.format(comment)
-            res = round_trip(s)
+            res = round_trip(s)  # NOQA
 
     def test_issue_161a(self):
         yaml_str = dedent("""\
@@ -56,7 +56,12 @@ class TestIssues:
         """)
         for comment in ['\n# between']:
             s = yaml_str.format(comment)
-            res = round_trip(s)
-            # print(s)
-            # print('------------')
-        # assert False
+            res = round_trip(s)  # NOQA
+
+    def test_issue_163(self):
+        s = dedent("""\
+        some-list:
+        # List comment
+        - {}
+        """)
+        x = round_trip(s, preserve_quotes=True)  # NOQA
diff --git a/parser.py b/parser.py
index 0707761..61ff673 100644
--- a/parser.py
+++ b/parser.py
@@ -434,9 +434,16 @@ class Parser(object):
             )
             self.state = self.parse_flow_sequence_first_entry
         elif self.scanner.check_token(FlowMappingStartToken):
+            pt = self.scanner.peek_token()
             end_mark = self.scanner.peek_token().end_mark
             event = MappingStartEvent(
-                anchor, tag, implicit, start_mark, end_mark, flow_style=True
+                anchor,
+                tag,
+                implicit,
+                start_mark,
+                end_mark,
+                flow_style=True,
+                comment=pt.comment,
             )
             self.state = self.parse_flow_mapping_first_key
         elif block and self.scanner.check_token(BlockSequenceStartToken):
diff --git a/tokens.py b/tokens.py
index 72c4f48..5176520 100644
--- a/tokens.py
+++ b/tokens.py
@@ -27,6 +27,10 @@ class Token(object):
                 arguments += u', line: ' + str(self.start_mark.line)
             except:  # NOQA
                 pass
+        try:
+            arguments += u', comment: ' + str(self._comment)
+        except:  # NOQA
+            pass
         return u'{}({})'.format(self.__class__.__name__, arguments)
 
     def add_post_comment(self, comment):