mirror of https://github.com/rust-lang/rust
24 lines
641 B
Rust
24 lines
641 B
Rust
//@ revisions: full min
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#![cfg_attr(full, feature(generic_const_exprs))]
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#![cfg_attr(full, allow(incomplete_features))]
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pub const fn is_zst<T: ?Sized>() -> usize {
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if std::mem::size_of::<T>() == 0 {
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//~^ ERROR the size for values of type `T` cannot be known at compilation time
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1
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} else {
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0
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}
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}
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pub struct AtLeastByte<T: ?Sized> {
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value: T,
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//~^ ERROR the size for values of type `T` cannot be known at compilation time
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pad: [u8; is_zst::<T>()],
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//[min]~^ ERROR generic parameters may not be used in const operations
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//[full]~^^ ERROR unconstrained generic constant
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}
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fn main() {}
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