Nit: improve comment in hr-fn-aau-eq-abu.rs
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@ -8,12 +8,16 @@
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test an interesting corner case: a fn that takes two arguments that
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// are references with the same lifetime is in fact equivalent to a fn
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// that takes two references with distinct lifetimes. This is true
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// because the two functions can call one another -- effectively, the
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// single lifetime `'a` is just inferred to be the intersection of the
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// two distinct lifetimes.
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// Test an interesting corner case that ought to be legal (though the
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// current code actually gets it wrong, see below): a fn that takes
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// two arguments that are references with the same lifetime is in fact
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// equivalent to a fn that takes two references with distinct
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// lifetimes. This is true because the two functions can call one
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// another -- effectively, the single lifetime `'a` is just inferred
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// to be the intersection of the two distinct lifetimes.
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//
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// FIXME: However, we currently reject this example with an error,
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// because of how we handle binders and equality in `relate_tys`.
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//
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// compile-flags:-Zno-leak-check
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@ -28,10 +32,6 @@ fn make_cell_aa() -> Cell<for<'a> fn(&'a u32, &'a u32)> {
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fn aa_eq_ab() {
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let a: Cell<for<'a, 'b> fn(&'a u32, &'b u32)> = make_cell_aa();
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//~^ ERROR higher-ranked subtype error
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//
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// FIXME -- this .. arguably ought to be accepted. However, the
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// current leak check also rejects this example, and it's kind of
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// a pain to support it. There are some comments in `relate_tys`
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drop(a);
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}
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