syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"self.map.get(&idx).unwrap_or(&self.bottom)"}]}
source_snippet:         self.map.get(&idx).unwrap_or(&self.bottom)
context_before:     fn get(&self, idx: ValueIndex) -> &V {
context_after:     }