syntax_data: {"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let variant_layout = ty_variant(cx, (ty, layout), index);
context_before:                 |index, encoding: Option<TagEncoding<VariantIdx>>| -> Result<Self, Err> {
context_after:                     if variant_layout.is_uninhabited() {