Fix typcheck

src/pystencilssfg/composer/basic_composer.py

@@ -719,7 +719,7 @@ class SfgFunctionSequencer(SfgFunctionSequencerBase):
     def __call__(self, *args: SequencerArg) -> None:
         # check if header is in HYBRID mode for c_interfacing enabled
         if self._cursor.context.c_interfacing:
-            assert isinstance(self._cursor.context.header_file.file_type, SfgSourceFileType.HYBRID_HEADER)
+            assert self._cursor.context.header_file.file_type == SfgSourceFileType.HYBRID_HEADER
 
         """Populate the function body"""
         tree = make_sequence(*args)

src/pystencilssfg/generator.py

@@ -177,8 +177,8 @@ class SourceFileGenerator:
             for inc in self._header_file.includes:
                 if inc.system_header and inc.__str__() in c_compatibility_headers:
                     c_header = inc.__str__().replace("<c", "<")
-                    self._header_file.hybrid_includes += HeaderFile(
-                        c_header, system_header=True)
+                    self._header_file.hybrid_includes += [HeaderFile(
+                        c_header, system_header=True)]
 
         if self._impl_file is not None:
             impl_includes = collect_includes(self._impl_file)

src/pystencilssfg/ir/entities.py

@@ -383,6 +383,8 @@ class SfgMethod(SfgClassMember, CommonFunctionProperties):
         self._virtual = virtual
         self._override = override
 
+        externC = False
+
         parameters = self.collect_params(tree, required_params)
 
         CommonFunctionProperties.__init__(
@@ -391,6 +393,7 @@ class SfgMethod(SfgClassMember, CommonFunctionProperties):
             parameters,
             return_type,
             inline,
+            externC,
             constexpr,
             attributes,
         )