interpreter|build: use typed_pos_args and unholder in the interpreter

For generator.process_files. Just cleaner and nicer

1 files changed, 3 insertions, 4 deletions

diff --git a/mesonbuild/build.py b/mesonbuild/build.py
index 24cddb0..9d1c0f9 100644
--- a/mesonbuild/build.py
+++ b/mesonbuild/build.py
@@ -1543,11 +1543,12 @@ class Generator:
         relpath = pathlib.PurePath(trial).relative_to(parent)
         return relpath.parts[0] != '..' # For subdirs we can only go "down".
 
-    def process_files(self, files, state, preserve_path_from=None, extra_args=None):
+    def process_files(self, files: T.List[T.Union[str, File, 'CustomTarget', 'CustomTargetIndex', 'GeneratedList']],
+                      state, preserve_path_from=None, extra_args=None):
         new = False
         output = GeneratedList(self, state.subdir, preserve_path_from, extra_args=extra_args if extra_args is not None else [])
         #XXX
-        for e in unholder(files):
+        for e in files:
             fs = [e]
             if isinstance(e, CustomTarget):
                 output.depends.add(e)
@@ -1561,8 +1562,6 @@ class Generator:
                 new = True
             elif isinstance(e, str):
                 fs = [File.from_source_file(state.environment.source_dir, state.subdir, e)]
-            elif not isinstance(e, File):
-                raise InvalidArguments(f'{self.name} arguments must be strings, files or CustomTargets, not {e!r}.')
 
             for f in fs:
                 if preserve_path_from: