1 use rustc_middle::mir::visit::Visitor;
2 use rustc_middle::mir::{Constant, Location};
3 use rustc_middle::ty::ConstKind;
5 pub struct RequiredConstsVisitor<'a, 'tcx> {
6 required_consts: &'a mut Vec<Constant<'tcx>>,
9 impl<'a, 'tcx> RequiredConstsVisitor<'a, 'tcx> {
10 pub fn new(required_consts: &'a mut Vec<Constant<'tcx>>) -> Self {
11 RequiredConstsVisitor { required_consts }
15 impl<'tcx> Visitor<'tcx> for RequiredConstsVisitor<'_, 'tcx> {
16 fn visit_constant(&mut self, constant: &Constant<'tcx>, _: Location) {
17 let literal = constant.literal;
18 if let Some(ct) = literal.const_for_ty() && let ConstKind::Unevaluated(_) = ct.kind() {
19 self.required_consts.push(*constant);