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Conditionally call normalize_erasing_regions only if polymorhization is enabled
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@ -2478,9 +2478,10 @@ impl<'tcx> ty::Instance<'tcx> {
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// `src/test/ui/polymorphization/normalized_sig_types.rs`), and codegen not keeping
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// track of a polymorphization `ParamEnv` to allow normalizing later.
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let mut sig = match *ty.kind() {
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ty::FnDef(def_id, substs) => tcx
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ty::FnDef(def_id, substs) if tcx.sess.opts.debugging_opts.polymorphize => tcx
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.normalize_erasing_regions(tcx.param_env(def_id), tcx.fn_sig(def_id))
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.subst(tcx, substs),
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ty::FnDef(def_id, substs) => tcx.fn_sig(def_id).subst(tcx, substs),
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_ => unreachable!(),
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};
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