Remove another duplicate def-creation

compiler/rustc_ast_lowering/src/expr.rs

@@ -14,12 +14,12 @@ use rustc_ast::ptr::P as AstP;
 use rustc_ast::*;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_hir as hir;
-use rustc_hir::def::{DefKind, Res};
+use rustc_hir::def::Res;
 use rustc_hir::HirId;
 use rustc_middle::span_bug;
 use rustc_session::errors::report_lit_error;
 use rustc_span::source_map::{respan, Spanned};
-use rustc_span::symbol::{kw, sym, Ident, Symbol};
+use rustc_span::symbol::{sym, Ident, Symbol};
 use rustc_span::DUMMY_SP;
 use rustc_span::{DesugaringKind, Span};
 use thin_vec::{thin_vec, ThinVec};
@@ -377,18 +377,8 @@ impl<'hir> LoweringContext<'_, 'hir> {
         let mut generic_args = ThinVec::new();
         for (idx, arg) in args.into_iter().enumerate() {
             if legacy_args_idx.contains(&idx) {
-                let parent_def_id = self.current_hir_id_owner;
                 let node_id = self.next_node_id();
 
-                // Add a definition for the in-band const def.
-                self.create_def(
-                    parent_def_id.def_id,
-                    node_id,
-                    kw::Empty,
-                    DefKind::AnonConst,
-                    f.span,
-                );
-
                 let anon_const = AnonConst { id: node_id, value: arg };
                 generic_args.push(AngleBracketedArg::Arg(GenericArg::Const(anon_const)));
             } else {

compiler/rustc_ast_lowering/src/lib.rs

@@ -2417,6 +2417,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         }
     }
 
+    #[instrument(level = "debug", skip(self))]
     fn lower_anon_const(&mut self, c: &AnonConst) -> &'hir hir::AnonConst {
         // Some ast::AnonConst's turn into ConstArgKind::Path's, so we create their def
         // only when we're sure they're going to stay as an AnonConst.