syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // reasonably detect which one we need (on older ones libc++ is
context_before:         // releases GCC's libstdc++ is default. Unfortunately we can't
context_after:         // available and can be selected with -stdlib=lib++), so assume the