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-rw-r--r--src/buildstream/_loader/metasource.py10
1 files changed, 10 insertions, 0 deletions
diff --git a/src/buildstream/_loader/metasource.py b/src/buildstream/_loader/metasource.py
index da2c0e292..5cf7dc7ba 100644
--- a/src/buildstream/_loader/metasource.py
+++ b/src/buildstream/_loader/metasource.py
@@ -20,6 +20,16 @@
class MetaSource():
+ __slots__ = (
+ 'element_name',
+ 'element_index',
+ 'element_kind',
+ 'kind',
+ 'config',
+ 'directory',
+ 'first_pass',
+ )
+
# MetaSource()
#
# An abstract object holding data suitable for constructing a Source