syntax_data: {"ast_node_type":"function","tokens":[{"end":64,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:         fn from_tag(tag: ScalarInt, tcx: TyCtxt<'tcx>) -> Self {
context_before:         /// Constructs a `Tree` representing the value of a enum tag.
context_after:             use rustc_abi::Endian;