syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"layout.variant_fields.iter().zip(&layout.variant_source_info)"}]}
source_snippet:         layout.variant_fields.iter().zip(&layout.variant_source_info)
context_before:     for (variant, yield_source_info) in
context_after:     {