syntax_data: {"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let location = Location { block, statement_index };
context_before:             for statement_index in (0..basic_blocks[block].statements.len()).rev() {
context_after:                 let statement = &basic_blocks[block].statements[statement_index];