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28 lines
1.0 KiB
Rust
28 lines
1.0 KiB
Rust
//! With `feature(generic_const_exprs)`, anon consts (e.g. length in array types) will
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//! inherit their parent's predicates. When combined with `feature(trivial_bounds)`, it
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//! is possible to have an unevaluated constant that is rigid, but not generic.
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//!
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//! This is what happens below: `u8: A` does not hold in the global environment, but
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//! with trivial bounds + GCE it it possible that `<u8 as A>::B` can appear in an array
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//! length without causing a compile error. This constant is *rigid* (i.e. it cannot be
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//! normalized further), but it is *not generic* (i.e. it does not depend on any generic
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//! parameters).
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//!
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//! This test ensures that we do not ICE in layout computation when encountering such a
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//! constant.
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#![feature(rustc_attrs)]
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#![feature(generic_const_exprs)] //~ WARNING: the feature `generic_const_exprs` is incomplete
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#![feature(trivial_bounds)]
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#![crate_type = "lib"]
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trait A {
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const B: usize;
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}
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#[rustc_layout(debug)]
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struct S([u8; <u8 as A>::B]) //~ ERROR: the type `[u8; <u8 as A>::B]` has an unknown layout
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where
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u8: A;
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