syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"Some(fn_decl.implicit_self)"}]}
source_snippet:                 Some(fn_decl.implicit_self)
context_before:             let self_kind = if index == 0 && fn_decl.implicit_self.has_implicit_self() {
context_after:             } else {