syntax_data: {"ast_node_type":"struct","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // size from the variant size if the struct is "enum"-like, so failing to account for it
context_before:             // This is important, since the layout printing code always subtracts this discriminant
context_after:             // will either lead to numerical underflow, or an underreported variant size...