41 lines
1.1 KiB
Rust
41 lines
1.1 KiB
Rust
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// This is a non-regression test for issue #114907 where an ICE happened because of missing
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// `UniverseInfo`s accessed during diagnostics.
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//
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// A couple notes:
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// - the `FnOnce` bounds need an arg that is a reference
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// - a custom `Drop` is needed somewhere in the type that `accept` returns, to create universes
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// during liveness and dropck outlives computation
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// check-fail
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trait Role {
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type Inner;
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}
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struct HandshakeCallback<C>(C);
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impl<C: FnOnce(&())> Role for HandshakeCallback<C> {
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type Inner = ();
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}
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struct Handshake<R: Role> {
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_inner: Option<R::Inner>,
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}
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impl<R: Role> Drop for Handshake<R> {
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fn drop(&mut self) {}
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}
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fn accept<C: FnOnce(&())>(_: C) -> Handshake<HandshakeCallback<C>> {
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todo!()
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}
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fn main() {
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let callback = |_| {};
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accept(callback);
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//~^ ERROR mismatched types
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//~| ERROR mismatched types
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//~| ERROR implementation of `FnOnce` is not general enough
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//~| ERROR implementation of `FnOnce` is not general enough
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//~| ERROR higher-ranked subtype error
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//~| ERROR higher-ranked subtype error
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}
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