syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"lint_level:"}]}
source_snippet:             lint_level: LintLevel::Explicit(arm.hir_id),
context_before:             body: self.mirror_expr(arm.body),
context_after:             scope: region::Scope { local_id: arm.hir_id.local_id, data: region::ScopeData::Node },