Assert that we don't capture escaping bound vars in Fn trait selection
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3 changed files with 20 additions and 13 deletions
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@ -693,16 +693,19 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
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let gen_sig = substs.as_generator().poly_sig();
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// (1) Feels icky to skip the binder here, but OTOH we know
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// that the self-type is an generator type and hence is
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// NOTE: The self-type is a generator type and hence is
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// in fact unparameterized (or at least does not reference any
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// regions bound in the obligation). Still probably some
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// refactoring could make this nicer.
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// regions bound in the obligation).
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let self_ty = obligation
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.predicate
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.self_ty()
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.no_bound_vars()
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.expect("unboxed closure type should not capture bound vars from the predicate");
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let trait_ref = super::util::generator_trait_ref_and_outputs(
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self.tcx(),
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obligation.predicate.def_id(),
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obligation.predicate.skip_binder().self_ty(), // (1)
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self_ty,
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gen_sig,
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)
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.map_bound(|(trait_ref, ..)| trait_ref);
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