syntax_data: {"ast_node_type":"variable","tokens":[{"end":96,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let Some(pass_name) = s.strip_prefix(&['+', '-'][..]) else { return false };
context_before:                 for s in s.split(',') {
context_after:                     slot.push((pass_name.to_string(), &s[..1] == "+"));