syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // If no remapping has been applied yet, try to do so
context_before:             RealFileName::LocalPath(unmapped_file_path) => {
context_after:                 let (new_path, was_remapped) = self.map_prefix(&unmapped_file_path);