syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// y: &'a u32)` and we want to give a name to the region of the
context_before:     /// This is used when you have a signature like `fn foo(x: &u32,
context_after:     /// reference `x`.