a9fc3901b0
Replace feature(never_type) with feature(exhaustive_patterns). feature(exhaustive_patterns) only covers the pattern-exhaustives checks that used to be covered by feature(never_type)
35 lines
995 B
Rust
35 lines
995 B
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 can call static methods on ! both directly and when it appears in a generic
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trait StringifyType {
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fn stringify_type() -> &'static str;
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}
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impl StringifyType for ! {
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fn stringify_type() -> &'static str {
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"!"
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}
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}
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fn maybe_stringify<T: StringifyType>(opt: Option<T>) -> &'static str {
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match opt {
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Some(_) => T::stringify_type(),
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None => "none",
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}
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}
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fn main() {
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println!("! is {}", <!>::stringify_type());
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println!("None is {}", maybe_stringify(None::<!>));
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}
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