syntax_data: {"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mut sysroot_dir = if dir.ends_with(crate::config::host_tuple()) {
context_before:         // if `dir` points to target's dir, move up to the sysroot
context_after:             dir.parent() // chop off `$target`