syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"ty::ConstKind::Placeholder(lhs)"}]}
source_snippet:             ty::ConstKind::Placeholder(lhs) => {
context_before:             // Placeholder consts don't unify with anything on their own
context_after:                 matches!(rhs.kind(), ty::ConstKind::Placeholder(rhs) if lhs == rhs)