Fix tokenizer fstring end positions

parso/python/tokenize.py

@@ -310,7 +310,7 @@ class FStringNode(object):
         return not self.is_in_expr() and self.format_spec_count
 
 
-def _close_fstring_if_necessary(fstring_stack, string, start_pos, additional_prefix):
+def _close_fstring_if_necessary(fstring_stack, string, line_nr, column, additional_prefix):
     for fstring_stack_index, node in enumerate(fstring_stack):
         lstripped_string = string.lstrip()
         len_lstrip = len(string) - len(lstripped_string)
@@ -318,7 +318,7 @@ def _close_fstring_if_necessary(fstring_stack, string, start_pos, additional_pre
             token = PythonToken(
                 FSTRING_END,
                 node.quote,
-                start_pos,
+                (line_nr, column + len_lstrip),
                 prefix=additional_prefix+string[:len_lstrip],
             )
             additional_prefix = ''
@@ -474,7 +474,8 @@ def tokenize_lines(lines, version_info, start_pos=(1, 0)):
                 fstring_end_token, additional_prefix, quote_length = _close_fstring_if_necessary(
                     fstring_stack,
                     rest,
-                    (lnum, pos),
+                    lnum,
+                    pos,
                     additional_prefix,
                 )
                 pos += quote_length

test/test_tokenize.py

@@ -414,3 +414,13 @@ def test_fstring(code, types, version_ge_py36):
 def test_fstring_assignment_expression(code, types, version_ge_py38):
     actual_types = [t.type for t in _get_token_list(code, version_ge_py38)]
     assert types + [ENDMARKER] == actual_types
+
+
+def test_fstring_end_error_pos(version_ge_py38):
+    f_start, f_string, bracket, f_end, endmarker = \
+        _get_token_list('f" { "', version_ge_py38)
+    assert f_start.start_pos == (1, 0)
+    assert f_string.start_pos == (1, 2)
+    assert bracket.start_pos == (1, 3)
+    assert f_end.start_pos == (1, 5)
+    assert endmarker.start_pos == (1, 6)