syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"shift_region(self.interner,"}]}
source_snippet:                 shift_region(self.interner, self.region, self.debruijn.as_u32())
context_before:             if self.debruijn == debruijn {
context_after:             } else {