syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // which must be nonnull per its documented safety requirements.
context_before:     // Set `nonnull` if the validity range excludes zero, or for the argument to `drop_in_place`,
context_after:     if !valid_range.contains(0) || drop_target_pointee.is_some() {