syntax_data: {"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // compare as equal.
context_before:     // won't catch some differences at the string level, e.g. "abc" and "abc/"
context_after:     mapping.map_prefix(path(p)).0.to_string_lossy().to_string()