syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"self.opts.unstable_opts.teach"}]}
source_snippet:         self.opts.unstable_opts.teach && self.dcx().must_teach(code)
context_before:     pub fn teach(&self, code: ErrCode) -> bool {
context_after:     }