syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // `normalize_erasing_regions` here and another one that can be called
context_before:     // One that can be called after typecheck has completed and can use
context_after:     // before typecheck has completed and uses `try_normalize_erasing_regions`.