syntax_data: {"ast_node_type":"impl","tokens":[{"end":83,"kind":"keyword","start":0,"text":"scalar_attrs:"}]}
source_snippet:         scalar_attrs: impl Fn(&TyAndLayout<'a, Ty>, Scalar, Size) -> ArgAttributes,
context_before:         layout: TyAndLayout<'a, Ty>,
context_after:     ) -> Self {