syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"Some(self.source_map().path_mapping().to_real_filename(self.io.input.opt_path()?))"}]}
source_snippet:         Some(self.source_map().path_mapping().to_real_filename(self.io.input.opt_path()?))
context_before:     pub fn local_crate_source_file(&self) -> Option<RealFileName> {
context_after:     }