mirror of https://github.com/rust-lang/rust
44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
// Test a case of a trait which extends the same supertrait twice, but
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// with difference type parameters. Test then that when we don't give
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// enough information to pick between these, no selection is made. In
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// this particular case, the two choices are i64/u64 -- so when we use
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// an integer literal, we wind up falling this literal back to i32.
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// See also `run-pass/trait-repeated-supertrait.rs`.
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trait CompareTo<T> {
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fn same_as(&self, t: T) -> bool;
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}
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trait CompareToInts : CompareTo<i64> + CompareTo<u64> {
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}
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impl CompareTo<i64> for i64 {
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fn same_as(&self, t: i64) -> bool { *self == t }
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}
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impl CompareTo<u64> for i64 {
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fn same_as(&self, t: u64) -> bool { *self == (t as i64) }
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}
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impl CompareToInts for i64 { }
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fn with_obj(c: &dyn CompareToInts) -> bool {
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c.same_as(22) //~ ERROR `dyn CompareToInts: CompareTo<i32>` is not satisfied
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}
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fn with_trait<C:CompareToInts>(c: &C) -> bool {
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c.same_as(22) //~ ERROR `C: CompareTo<i32>` is not satisfied
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}
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fn with_ufcs1<C:CompareToInts>(c: &C) -> bool {
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<dyn CompareToInts>::same_as(c, 22) //~ ERROR `dyn CompareToInts: CompareTo<i32>` is not satisfi
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}
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fn with_ufcs2<C:CompareToInts>(c: &C) -> bool {
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CompareTo::same_as(c, 22) //~ ERROR `C: CompareTo<i32>` is not satisfied
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}
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fn main() {
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assert_eq!(22_i64.same_as(22), true); //~ ERROR `i64: CompareTo<i32>` is not satisfied
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}
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