mirror of
https://github.com/rust-lang/rust
synced 2024-10-03 07:14:34 +00:00
23 lines
490 B
Rust
23 lines
490 B
Rust
//@ run-pass
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use std::collections::HashMap;
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trait Graph<Node, Edge> {
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fn f(&self, _: Edge); //~ WARN methods `f` and `g` are never used
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fn g(&self, _: Node);
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}
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impl<E> Graph<isize, E> for HashMap<isize, isize> {
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fn f(&self, _e: E) {
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panic!();
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}
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fn g(&self, _e: isize) {
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panic!();
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}
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}
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pub fn main() {
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let g : Box<HashMap<isize,isize>> = Box::new(HashMap::new());
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let _g2 : Box<dyn Graph<isize,isize>> = g as Box<dyn Graph<isize,isize>>;
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}
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