Fix broken type hints for nested functions

nimporter/nexporter.py

@@ -257,6 +257,27 @@ def compile_extensions_to_c(platforms: List[str], root: Path) -> None:
     return
 
 
+def _is_valid_identifier(string: str) -> Union[Match[str], None, bool]:
+        import re
+        match = re.search('^[A-Za-z_][A-Z-a-z0-9_\\-]*', string)
+        return match and len(match.string) == len(string)
+
+
+def _is_semver(string: str) -> bool:
+    try:
+        lib_name, lib_version = string.rsplit('-', maxsplit=1)
+        assert _is_valid_identifier(lib_name)
+
+        major, minor, patch = lib_version.split('.')
+        assert major.isdigit()
+        assert minor.isdigit()
+        assert patch.isdigit()
+
+        return True
+    except:
+        return False
+
+
 def prevent_win32_max_path_length_error(path: Path) -> None:
     """
     Nim generates C files that contain `@` symbols to encode the original path
@@ -275,25 +296,6 @@ def prevent_win32_max_path_length_error(path: Path) -> None:
     That's a lot less characters!
     """
 
-    def is_valid_identifier(string: str) -> Union[Match[str], None, bool]:
-        import re
-        match = re.search('^[A-Za-z_][A-Z-a-z0-9_\\-]*', string)
-        return match and len(match.string) == len(string)
-
-    def is_semver(string: str) -> bool:
-        try:
-            lib_name, lib_version = string.rsplit('-', maxsplit=1)
-            assert is_valid_identifier(lib_name)
-
-            major, minor, patch = lib_version.split('.')
-            assert major.isdigit()
-            assert minor.isdigit()
-            assert patch.isdigit()
-
-            return True
-        except:
-            return False
-
     for item in path.iterdir():
         if item.is_file() and item.name.startswith('@m'):
 
@@ -307,7 +309,7 @@ def is_semver(string: str) -> bool:
                 segments = item.name.replace('@m', '').split('@s')
 
                 for segment in reversed(segments):
-                    if is_semver(segment):
+                    if _is_semver(segment):
                         index = segments.index(segment)
                         mod_name = '@'.join(segments[index:])
                         break