88 lines
1.7 KiB
Rust
88 lines
1.7 KiB
Rust
// check-pass
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#![allow(dead_code, incomplete_features)]
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#![feature(generic_const_exprs)]
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const fn min(a: usize, b: usize) -> usize {
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if a < b {
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a
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} else {
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b
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}
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}
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trait Trait1<Inner1>
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where
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Self: Sized,
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{
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fn crash_here()
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where
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Inner1: Default,
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{
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Inner1::default();
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}
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}
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struct Struct1<T>(T);
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impl<T> Trait1<T> for Struct1<T> {}
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trait Trait2<Inner2>
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where
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Self: Sized,
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{
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type Assoc: Trait1<Inner2>;
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fn call_crash()
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where
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Inner2: Default,
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{
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// if Inner2 implements Default, we can call crash_here.
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Self::Assoc::crash_here();
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}
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}
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struct Struct2<const SIZE1: usize, const SIZE2: usize> {}
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/*
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where
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[(); min(SIZE1, SIZE2)]:,
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{
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elem: [i32; min(SIZE1, SIZE2)],
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}
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*/
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impl<const SIZE1: usize, const SIZE2: usize> Trait2<[i32; min(SIZE1, SIZE2)]>
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for Struct2<SIZE1, SIZE2>
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{
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type Assoc = Struct1<[i32; min(SIZE1, SIZE2)]>;
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// dose Struct1<[i32; min(SIZE1, SIZE2)]> implement Default?
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}
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fn main() {
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pattern2();
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print_fully_name(<Struct2<1, 2> as Trait2<[i32; min(1, 2)]>>::Assoc::crash_here);
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// <compiler_bug2::Struct1<[i32; 1]> as compiler_bug2::Trait1<[i32; 1]>>::crash_here
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}
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fn pattern1() {
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// no crash
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<Struct2<1, 2> as Trait2<[i32; min(1, 2)]>>::Assoc::crash_here();
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<Struct2<1, 2> as Trait2<[i32; min(1, 2)]>>::call_crash();
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}
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fn pattern2() {
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// crash
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<Struct2<1, 2> as Trait2<[i32; min(1, 2)]>>::call_crash();
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// undefined reference to `compiler_bug2::Trait1::crash_here'
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}
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fn pattern3() {
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// no crash
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<Struct2<1, 2> as Trait2<[i32; min(1, 2)]>>::Assoc::crash_here();
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}
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fn print_fully_name<T>(_: T) {
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let _ = std::any::type_name::<T>();
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}
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