101 lines
4.0 KiB
Rust
101 lines
4.0 KiB
Rust
//@ compile-flags: -Zdeduplicate-diagnostics=yes
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// This test of structural match checking enumerates the different kinds of
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// const definitions, collecting cases where the const pattern is rejected.
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//
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// Note: Even if a non-structural-match type is part of an expression in a
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// const's definition, that does not necessarily disqualify the const from being
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// a match pattern: in principle, we just need the types involved in the final
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// value to be structurally matchable.
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// See also RFC 1445
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#![feature(type_ascription)]
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#[derive(Copy, Clone, Debug)]
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struct NoPartialEq;
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#[derive(Copy, Clone, Debug)]
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struct NoDerive;
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// This impl makes `NoDerive` irreflexive.
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impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } }
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impl Eq for NoDerive { }
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type OND = Option<NoDerive>;
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struct TrivialEq(OND);
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// This impl makes `TrivialEq` trivial.
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impl PartialEq for TrivialEq { fn eq(&self, _: &Self) -> bool { true } }
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impl Eq for TrivialEq { }
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fn main() {
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#[derive(PartialEq, Eq, Debug)]
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enum Derive<X> { Some(X), None, }
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const ENUM: Derive<NoDerive> = Derive::Some(NoDerive);
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match Derive::Some(NoDerive) { ENUM => dbg!(ENUM), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const FIELD: OND = TrivialEq(Some(NoDerive)).0;
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match Some(NoDerive) { FIELD => dbg!(FIELD), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const NO_DERIVE_SOME: OND = Some(NoDerive);
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const INDIRECT: OND = NO_DERIVE_SOME;
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match Some(NoDerive) {INDIRECT => dbg!(INDIRECT), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const TUPLE: (OND, OND) = (None, Some(NoDerive));
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match (None, Some(NoDerive)) { TUPLE => dbg!(TUPLE), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const TYPE_ASCRIPTION: OND = type_ascribe!(Some(NoDerive), OND);
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match Some(NoDerive) { TYPE_ASCRIPTION => dbg!(TYPE_ASCRIPTION), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const ARRAY: [OND; 2] = [None, Some(NoDerive)];
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match [None, Some(NoDerive)] { ARRAY => dbg!(ARRAY), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const REPEAT: [OND; 2] = [Some(NoDerive); 2];
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match [Some(NoDerive); 2] { REPEAT => dbg!(REPEAT), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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trait Trait: Sized { const ASSOC: Option<Self>; }
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impl Trait for NoDerive { const ASSOC: Option<NoDerive> = Some(NoDerive); }
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match Some(NoDerive) { NoDerive::ASSOC => dbg!(NoDerive::ASSOC), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const BLOCK: OND = { NoDerive; Some(NoDerive) };
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match Some(NoDerive) { BLOCK => dbg!(BLOCK), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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const ADDR_OF: &OND = &Some(NoDerive);
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match &Some(NoDerive) { ADDR_OF => dbg!(ADDR_OF), _ => panic!("whoops"), };
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//~^ ERROR must be annotated with `#[derive(PartialEq)]`
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//~| NOTE the traits must be derived
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//~| NOTE StructuralPartialEq.html for details
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}
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