syntax_data: {"ast_node_type":"variable","tokens":[{"end":54,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let block_data = &mut basic_blocks[current_block];
context_before:     let invalid_discr_block = basic_blocks.push(invalid_discr_block_data);
context_after:     let discr_place = insert_discr_cast_to_u128(