syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"matches!(rhs.kind(),"}]}
source_snippet:                 matches!(rhs.kind(), ty::ConstKind::Placeholder(rhs) if lhs == rhs)
context_before:             ty::ConstKind::Placeholder(lhs) => {
context_after:             }