{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"//"}]}
            // "{async_fn_env#0}<T1, T2, ...>", etc.
            // Name will be "{closure_env#0}<T1, T2, ...>", "{coroutine_env#0}<T1, T2, ...>", or
            // In the case of cpp-like debuginfo, the name additionally gets wrapped inside of