mirror of https://github.com/rust-lang/rust
39 lines
1014 B
Rust
39 lines
1014 B
Rust
//@ run-pass
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// Test where the impl self type uses a projection from a constant type.
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trait Int
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{
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type T;
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fn dummy(&self) { } //~ WARN method `dummy` is never used
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}
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trait NonZero
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{
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fn non_zero(self) -> bool;
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}
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impl Int for i32 { type T = i32; }
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impl Int for i64 { type T = i64; }
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impl Int for u32 { type T = u32; }
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impl Int for u64 { type T = u64; }
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impl NonZero for <i32 as Int>::T { fn non_zero(self) -> bool { self != 0 } }
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impl NonZero for <i64 as Int>::T { fn non_zero(self) -> bool { self != 0 } }
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impl NonZero for <u32 as Int>::T { fn non_zero(self) -> bool { self != 0 } }
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impl NonZero for <u64 as Int>::T { fn non_zero(self) -> bool { self != 0 } }
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fn main ()
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{
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assert!(NonZero::non_zero(22_i32));
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assert!(NonZero::non_zero(22_i64));
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assert!(NonZero::non_zero(22_u32));
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assert!(NonZero::non_zero(22_u64));
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assert!(!NonZero::non_zero(0_i32));
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assert!(!NonZero::non_zero(0_i64));
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assert!(!NonZero::non_zero(0_u32));
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assert!(!NonZero::non_zero(0_u64));
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}
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