syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"layout:"}]}
source_snippet:         layout: TyAndLayout<'a, Ty>,
context_before:         cx: &impl HasDataLayout,
context_after:         scalar_attrs: impl Fn(&TyAndLayout<'a, Ty>, Scalar, Size) -> ArgAttributes,