syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // the element type of the vector is generic.
context_before:             // This error isn't caught in typeck, e.g., if
context_after:             cx.tcx().dcx().emit_fatal(NonPrimitiveSimdType { ty, e_ty: field.ty })