Remove an unnecessary field from a NonConstOp

compiler/rustc_mir/src/transform/check_consts/ops.rs

@@ -72,7 +72,7 @@ fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<
 
 /// A function call where the callee is not marked as `const`.
 #[derive(Debug)]
-pub struct FnCallNonConst(pub DefId);
+pub struct FnCallNonConst;
 impl NonConstOp for FnCallNonConst {
     fn build_error(&self, ccx: &ConstCx<'_, 'tcx>, span: Span) -> DiagnosticBuilder<'tcx> {
         struct_span_err!(

compiler/rustc_mir/src/transform/check_consts/validation.rs

@@ -817,7 +817,7 @@ fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location
                 // Attempting to call a trait method?
                 if let Some(trait_id) = tcx.trait_of_item(callee) {
                     if !self.tcx.features().const_trait_impl {
-                        self.check_op(ops::FnCallNonConst(callee));
+                        self.check_op(ops::FnCallNonConst);
                         return;
                     }
 
@@ -883,7 +883,7 @@ fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location
                 }
 
                 if !tcx.is_const_fn_raw(callee) {
-                    self.check_op(ops::FnCallNonConst(callee));
+                    self.check_op(ops::FnCallNonConst);
                     return;
                 }