syntax_data: {"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":".mir_opt_level"}]}
source_snippet:             .mir_opt_level
context_before:             .unstable_opts
context_after:             .unwrap_or_else(|| if self.opts.optimize != OptLevel::No { 2 } else { 1 })