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skip_binder to instantiate_identity #116340

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Oct 2, 2023
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skip_binder to instantiate_identity #116340

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9 changes: 7 additions & 2 deletions compiler/rustc_middle/src/ty/instance.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -617,12 +617,17 @@ impl<'tcx> Instance<'tcx> {
v: EarlyBinder<T>,
) -> Result<T, NormalizationError<'tcx>>
where
T: TypeFoldable<TyCtxt<'tcx>> + Clone,
T: TypeFoldable<TyCtxt<'tcx>>,
{
if let Some(args) = self.args_for_mir_body() {
tcx.try_instantiate_and_normalize_erasing_regions(args, param_env, v)
} else {
tcx.try_normalize_erasing_regions(param_env, v.skip_binder())
// We're using `instantiate_identity` as e.g.
// `FnPtrShim` is separately generated for every
// instantiation of the `FnDef`, so the MIR body
// is already instantiated. Any generic parameters it
// contains are generic parameters from the caller.
tcx.try_normalize_erasing_regions(param_env, v.instantiate_identity())
}
}

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