syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":".filter_map(|x|"}]}
source_snippet:                 .filter_map(|x| x.map(|reg| reg.size))
context_before:                 .iter()
context_after:                 .fold(Size::ZERO, |acc, size| acc + size)