9d3f57ef08
region-parameterization/variance inference. We now compute variance for type parameters but do not make use of it (most of the way towards #3598).
43 lines
1.4 KiB
Rust
43 lines
1.4 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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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 that we correctly infer variance for region parameters in
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// case that involve multiple intracrate types.
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// Try enums too.
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#[rustc_variance]
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enum Base<'a, 'b, 'c, 'd> { //~ ERROR region_params=[+, -, o, *]
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Test8A(extern "Rust" fn(&'a int)),
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Test8B(&'b [int]),
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Test8C(&'b mut &'c str),
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}
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#[rustc_variance]
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struct Derived1<'w, 'x, 'y, 'z> { //~ ERROR region_params=[*, o, -, +]
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f: Base<'z, 'y, 'x, 'w>
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}
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#[rustc_variance] // Combine - and + to yield o
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struct Derived2<'a, 'b, 'c> { //~ ERROR region_params=[o, o, *]
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f: Base<'a, 'a, 'b, 'c>
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}
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#[rustc_variance] // Combine + and o to yield o (just pay attention to 'a here)
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struct Derived3<'a, 'b, 'c> { //~ ERROR region_params=[o, -, *]
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f: Base<'a, 'b, 'a, 'c>
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}
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#[rustc_variance] // Combine + and * to yield + (just pay attention to 'a here)
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struct Derived4<'a, 'b, 'c> { //~ ERROR region_params=[+, -, o]
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f: Base<'a, 'b, 'c, 'a>
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}
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fn main() {}
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