syntax_data: {"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let kernel_max = Path::new("/sys/devices/system/cpu/kernel_max");
context_before:     // stat always says that /sys/devices/system/cpu/kernel_max is the size of a block.
context_after:     let len = std::fs::metadata(kernel_max).unwrap().len() as usize;