syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"PatKind::Constant"}]}
source_snippet:                 PatKind::Constant { value } => value,
context_before:             let value = match arm.pattern.kind {
context_after:                 PatKind::ExpandedConstant { ref subpattern, def_id: _ }