14 lines
342 B
Rust
14 lines
342 B
Rust
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iface monad<A> {
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fn bind<B>(fn(A) -> self<B>);
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}
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impl monad<A> of monad<A> for [A] {
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fn bind<B>(f: fn(A) -> [B]) {
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let mut r = fail;
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for self.each {|elt| r += f(elt); }
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//!^ WARNING unreachable expression
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//!^^ ERROR the type of this value must be known
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}
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}
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fn main() {
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["hi"].bind {|x| [x] };
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}
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