syntax_data: {"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"pub(crate)"}]}
source_snippet:     pub(crate) fn as_constant(&mut self, expr: &Expr<'tcx>) -> ConstOperand<'tcx> {
context_before:     /// `expr` is a valid compile-time constant!
context_after:         let this = self;