{"ast_node_type":"import","tokens":[{"end":99,"kind":"keyword","start":0,"text":"///"}]}
    /// use a dummy expander that always errors. This comes with the drawback of macros potentially
    /// help by the build system. So, when the macro isn't found in `self.proc_macros`, we instead
    /// going out of sync with what the build system sees (since we resolve using VFS state, but