syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"LayoutCalculatorError::UnexpectedUnsized(field)"}]}
source_snippet:         LayoutCalculatorError::UnexpectedUnsized(field) => {
context_before:         }
context_after:             // This is sometimes not a compile error if there are trivially false where clauses.