syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // One that can be called after typecheck has completed and can use
context_before:     // FIXME: We might want to have two different versions of `layout_of`:
context_after:     // `normalize_erasing_regions` here and another one that can be called