syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"ProjectionKind::Field(idx,"}]}
source_snippet:                 ProjectionKind::Field(idx, VariantIdx::ZERO) => {
context_before:                 ProjectionKind::Deref => mir::ProjectionElem::Deref,
context_after:                     mir::ProjectionElem::Field(idx, elem.ty)