syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"GenericParamDefKind::Type"}]}
source_snippet:             GenericParamDefKind::Type { has_default, .. } => {
context_before:             GenericParamDefKind::Lifetime | GenericParamDefKind::Const { .. } => bug!(),
context_after:                 if param.index == 0 {