syntax_data: {"ast_node_type":"import","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // It's important that we convert to a string here because that's what
context_before: fn map_path_prefix(mapping: &FilePathMapping, p: &str) -> String {
context_after:     // later stages do too (e.g. in the backend), and comparing `Path` values