43 lines
751 B
Rust
43 lines
751 B
Rust
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// build-pass
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#![allow(incomplete_features)]
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#![feature(generic_const_exprs)]
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trait TraitOne {
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const MY_NUM: usize;
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type MyErr: std::fmt::Debug;
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fn do_one_stuff(arr: [u8; Self::MY_NUM]) -> Result<(), Self::MyErr>;
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}
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trait TraitTwo {
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fn do_two_stuff();
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}
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impl<O: TraitOne> TraitTwo for O
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where
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[(); Self::MY_NUM]:,
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{
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fn do_two_stuff() {
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O::do_one_stuff([5; Self::MY_NUM]).unwrap()
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}
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}
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struct Blargotron;
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#[derive(Debug)]
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struct ErrTy<const N: usize>([(); N]);
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impl TraitOne for Blargotron {
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const MY_NUM: usize = 3;
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type MyErr = ErrTy<{ Self::MY_NUM }>;
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fn do_one_stuff(_arr: [u8; Self::MY_NUM]) -> Result<(), Self::MyErr> {
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Ok(())
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}
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}
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fn main() {
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Blargotron::do_two_stuff();
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}
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