syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"builder.source_scopes[OUTERMOST_SOURCE_SCOPE].parent_scope"}]}
source_snippet:         builder.source_scopes[OUTERMOST_SOURCE_SCOPE].parent_scope = None;
context_before:         assert_eq!(builder.new_source_scope(span, lint_level), OUTERMOST_SOURCE_SCOPE);