2020-10-17 13:01:10 -05:00
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// This file tests the exhaustiveness algorithm on opaque constants. Most of the examples give
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// unnecessary warnings because const_to_pat.rs converts a constant pattern to a wildcard when the
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// constant is not allowed as a pattern. This is an edge case so we may not care to fix it.
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// See also https://github.com/rust-lang/rust/issues/78057
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#![deny(unreachable_patterns)]
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#[derive(PartialEq)]
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struct Foo(i32);
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impl Eq for Foo {}
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const FOO: Foo = Foo(42);
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const FOO_REF: &Foo = &Foo(42);
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const FOO_REF_REF: &&Foo = &&Foo(42);
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#[derive(PartialEq)]
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struct Bar;
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impl Eq for Bar {}
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const BAR: Bar = Bar;
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#[derive(PartialEq)]
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enum Baz {
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Baz1,
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Baz2,
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2020-10-17 13:01:10 -05:00
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}
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impl Eq for Baz {}
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const BAZ: Baz = Baz::Baz1;
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2022-12-15 09:11:51 -06:00
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#[rustfmt::skip]
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2020-10-17 13:01:10 -05:00
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fn main() {
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match FOO {
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FOO => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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_ => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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}
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match FOO_REF {
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FOO_REF => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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Foo(_) => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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}
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2020-10-19 18:06:00 -05:00
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// This used to cause an ICE (https://github.com/rust-lang/rust/issues/78071)
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match FOO_REF_REF {
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FOO_REF_REF => {}
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//~^ WARNING must be annotated with `#[derive(PartialEq, Eq)]`
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//~| WARNING this was previously accepted by the compiler but is being phased out
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Foo(_) => {}
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}
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2020-10-17 13:01:10 -05:00
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match BAR {
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Bar => {}
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BAR => {} // should not be emitting unreachable warning
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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//~| ERROR unreachable pattern
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_ => {}
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//~^ ERROR unreachable pattern
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}
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match BAR {
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BAR => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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Bar => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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_ => {}
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//~^ ERROR unreachable pattern
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}
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match BAR {
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BAR => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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BAR => {} // should not be emitting unreachable warning
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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//~| ERROR unreachable pattern
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_ => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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}
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match BAZ {
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BAZ => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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Baz::Baz1 => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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_ => {}
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//~^ ERROR unreachable pattern
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}
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match BAZ {
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Baz::Baz1 => {}
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BAZ => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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_ => {}
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//~^ ERROR unreachable pattern
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}
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match BAZ {
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BAZ => {}
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//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
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Baz::Baz2 => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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_ => {} // should not be emitting unreachable warning
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//~^ ERROR unreachable pattern
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}
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2020-11-14 15:50:53 -06:00
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type Quux = fn(usize, usize) -> usize;
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fn quux(a: usize, b: usize) -> usize { a + b }
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const QUUX: Quux = quux;
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2020-10-17 13:01:10 -05:00
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match QUUX {
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QUUX => {}
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2020-10-18 07:48:54 -05:00
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QUUX => {}
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2020-10-17 13:01:10 -05:00
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_ => {}
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}
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2020-11-14 15:50:53 -06:00
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#[derive(PartialEq, Eq)]
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struct Wrap<T>(T);
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const WRAPQUUX: Wrap<Quux> = Wrap(quux);
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match WRAPQUUX {
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WRAPQUUX => {}
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WRAPQUUX => {}
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Wrap(_) => {}
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}
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match WRAPQUUX {
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Wrap(_) => {}
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2022-12-15 09:11:51 -06:00
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WRAPQUUX => {}
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}
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match WRAPQUUX {
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Wrap(_) => {}
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}
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match WRAPQUUX {
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//~^ ERROR: non-exhaustive patterns: `Wrap(_)` not covered
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WRAPQUUX => {}
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2020-11-14 15:50:53 -06:00
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}
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#[derive(PartialEq, Eq)]
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enum WhoKnows<T> {
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Yay(T),
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Nope,
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};
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const WHOKNOWSQUUX: WhoKnows<Quux> = WhoKnows::Yay(quux);
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match WHOKNOWSQUUX {
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WHOKNOWSQUUX => {}
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WhoKnows::Yay(_) => {}
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WHOKNOWSQUUX => {}
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WhoKnows::Nope => {}
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}
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2020-10-17 13:01:10 -05:00
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}
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