mirror of https://github.com/rust-lang/rust
60 lines
1.5 KiB
Rust
60 lines
1.5 KiB
Rust
// rust-lang/rust#62614: we want to allow matching on constants of types that
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// have non-structural-match variants, *if* the constant itself does not use
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// any such variant.
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// NOTE: for now, deliberately leaving the lint `indirect_structural_match` set
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// to its default, so that we will not issue a diangostic even if
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// rust-lang/rust#62614 remains an open issue.
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//@ run-pass
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struct Sum(u32, u32);
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impl PartialEq for Sum {
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fn eq(&self, other: &Self) -> bool { self.0 + self.1 == other.0 + other.1 }
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}
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impl Eq for Sum { }
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#[derive(PartialEq, Eq)]
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enum Eek {
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TheConst,
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UnusedByTheConst(Sum)
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}
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const THE_CONST: Eek = Eek::TheConst;
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const SUM_THREE: Eek = Eek::UnusedByTheConst(Sum(3,0));
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const EEK_ZERO: &[Eek] = &[];
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const EEK_ONE: &[Eek] = &[THE_CONST];
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pub fn main() {
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match Eek::UnusedByTheConst(Sum(1,2)) {
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ref sum if sum == &SUM_THREE => { println!("Hello 0"); }
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_ => { println!("Gbye"); }
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}
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match Eek::TheConst {
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THE_CONST => { println!("Hello 1"); }
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_ => { println!("Gbye"); }
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}
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match & &Eek::TheConst {
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& & THE_CONST => { println!("Hello 2"); }
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_ => { println!("Gbye"); }
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}
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match & & &[][..] {
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& & EEK_ZERO => { println!("Hello 3"); }
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& & EEK_ONE => { println!("Gbye"); }
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_ => { println!("Gbye"); }
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}
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match & & &[Eek::TheConst][..] {
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& & EEK_ZERO => { println!("Gby"); }
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& & EEK_ONE => { println!("Hello 4"); }
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_ => { println!("Gbye"); }
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}
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}
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