mirror of https://github.com/rust-lang/rust
40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
//@ revisions: min adt_const_params full
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#![cfg_attr(full, feature(adt_const_params, unsized_const_params))]
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#![cfg_attr(full, allow(incomplete_features))]
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#![cfg_attr(adt_const_params, feature(adt_const_params))]
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#![cfg_attr(adt_const_params, allow(incomplete_features))]
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struct Checked<const F: fn(usize) -> bool>;
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//~^ ERROR: using function pointers as const generic parameters
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fn not_one(val: usize) -> bool {
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val != 1
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}
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fn not_two(val: usize) -> bool {
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val != 2
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}
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fn generic_arg<T>(val: T) -> bool {
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true
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}
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fn generic<T>(val: usize) -> bool {
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val != 1
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}
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fn main() {
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let _: Option<Checked<not_one>> = None;
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let _: Checked<not_one> = Checked::<not_one>;
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let _: Checked<not_one> = Checked::<not_two>;
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let _ = Checked::<generic_arg>;
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let _ = Checked::<{ generic_arg::<usize> }>;
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let _ = Checked::<{ generic_arg::<u32> }>; //~ ERROR: mismatched types
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let _ = Checked::<generic>; //~ ERROR: type annotations needed
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let _ = Checked::<{ generic::<u16> }>;
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let _: Checked<{ generic::<u16> }> = Checked::<{ generic::<u16> }>;
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let _: Checked<{ generic::<u32> }> = Checked::<{ generic::<u16> }>;
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}
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