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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/consts/const_in_pattern/reject_non_partial_eq.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/ui/consts/const_in_pattern/reject_non_partial_eq.rs b/src/test/ui/consts/const_in_pattern/reject_non_partial_eq.rs new file mode 100644 index 000000000..a8216901c --- /dev/null +++ b/src/test/ui/consts/const_in_pattern/reject_non_partial_eq.rs @@ -0,0 +1,32 @@ +// This test is illustrating the difference between how failing to derive +// `PartialEq` is handled compared to failing to implement it at all. + +// See also RFC 1445 + +#[derive(PartialEq, Eq)] +struct Structural(u32); + +struct NoPartialEq(u32); + +struct NoDerive(u32); + +// This impl makes NoDerive irreflexive. +impl PartialEq for NoDerive { fn eq(&self, _: &Self) -> bool { false } } + +impl Eq for NoDerive { } + +const NO_DERIVE_NONE: Option<NoDerive> = None; +const NO_PARTIAL_EQ_NONE: Option<NoPartialEq> = None; + +fn main() { + match None { + NO_DERIVE_NONE => println!("NO_DERIVE_NONE"), + _ => panic!("whoops"), + } + + match None { + NO_PARTIAL_EQ_NONE => println!("NO_PARTIAL_EQ_NONE"), + //~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]` + _ => panic!("whoops"), + } +} |