mirror of https://github.com/rust-lang/rust
34 lines
942 B
Rust
34 lines
942 B
Rust
// Tests that array sizes that depend on const-params are checked using `ConstEvaluatable`.
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//@ revisions: full min
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#![cfg_attr(full, feature(generic_const_exprs, adt_const_params))]
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#![cfg_attr(full, allow(incomplete_features))]
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#[allow(dead_code)]
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struct ArithArrayLen<const N: usize>([u32; 0 + N]);
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//[full]~^ ERROR unconstrained generic constant
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//[min]~^^ ERROR generic parameters may not be used in const operations
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#[cfg(full)]
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use std::marker::ConstParamTy;
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#[derive(PartialEq, Eq)]
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#[cfg_attr(full, derive(ConstParamTy))]
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struct Config {
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arr_size: usize,
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}
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struct B<const CFG: Config> {
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//[min]~^ ERROR `Config` is forbidden
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arr: [u8; CFG.arr_size],
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//[full]~^ ERROR overly complex generic constant
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//[min]~^^ ERROR generic parameters may not be used in const operations
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}
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const C: Config = Config { arr_size: 5 };
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fn main() {
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let b = B::<C> { arr: [1, 2, 3, 4, 5] };
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assert_eq!(b.arr.len(), 5);
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}
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