Fix for docstrings on source files

`doxy_dict` attribute created in wrong place

Author: ZedThree

ford/sourceform.py

@@ -259,7 +259,6 @@ def __init__(
     ):
         self.name = "unknown"
         self.visible = False
-        self.doxy_dict: Dict[str, str] = {}
         self.permission = inherited_permission.lower()
         self.strings: List[str] = strings or []
 
@@ -820,6 +819,7 @@ def __init__(
         self.VARIABLE_RE = re.compile(
             self.VARIABLE_STRING.format(typestr), re.IGNORECASE
         )
+        self.doxy_dict: Dict[str, str] = {}
 
         # This is a little bit confusing, because `permission` here is sort of
         # overloaded for "permission for this entity", and "permission for child

test/test_sourceform.py

@@ -2375,3 +2375,13 @@ def test_doxygen_multiple_metadata(parse_fortran_file):
     assert module.meta.author == "Foo Shamaloo"
     assert module.meta.version == "3.14"
     assert module.doc_list == [" Main details"]
+
+
+def test_doxygen_ok_on_source_file(parse_fortran_file):
+    data = """\
+    !! @brief Source file
+    module a
+    end module a
+    """
+    fortran_file = parse_fortran_file(data)
+    assert fortran_file.meta.summary == "Source file"