syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"base:"}]}
source_snippet:                             base: match base {
context_before:                             fields: self.field_refs(fields),
context_after:                                 hir::StructTailExpr::Base(base) => AdtExprBase::Base(FruInfo {