{"ast_node_type":"variable","tokens":[{"end":76,"kind":"keyword","start":0,"text":"let"}]}
        let scope = &self.debug_context.as_ref()?.scopes[source_info.scope];
    ) -> Option<(Bx::DIScope, Option<Bx::DILocation>, Span)> {
        let span = hygiene::walk_chain_collapsed(source_info.span, self.mir.span);