syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"RegionsInsufficientlyPolymorphic(I::BoundRegion,"}]}
source_snippet:     RegionsInsufficientlyPolymorphic(I::BoundRegion, I::Region),
context_before:     RegionsDoesNotOutlive(I::Region, I::Region),
context_after:     RegionsPlaceholderMismatch,