syntax_data: {"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // better, but this "works" for now.
context_before:             // to factor in the size of the discriminant manually. This really should be refactored
context_after:             if layout.fields.offset(tag_field.as_usize()) >= variant_size {