syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                         let unmapped_file_path_abs =
context_before:                     RealFileName::LocalPath(unmapped_working_dir_abs) => {
context_after:                             unmapped_working_dir_abs.join(unmapped_file_path_rel);