syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"AdtExprBase::Base(FruInfo"}]}
source_snippet:                     AdtExprBase::Base(FruInfo { base, field_types }) => {
context_before:                     }
context_after:                         let place_builder = unpack!(block = this.as_place_builder(block, *base));