60 lines
1.5 KiB
Rust
60 lines
1.5 KiB
Rust
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// ICE argument to function with "rust-call" ABI is not a tuple
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// issue: rust-lang/rust#81974
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#![feature(unboxed_closures)]
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#![feature(fn_traits)]
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use std::collections::HashMap;
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use std::hash::Hash;
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struct CachedFun<A, B> {
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cache: HashMap<A, B>,
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fun: fn(&mut CachedFun<A, B>, A) -> B,
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}
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impl<A: Eq + Hash, B> CachedFun<A, B> {
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fn new(fun: fn(&mut Self, A) -> B) -> Self {
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CachedFun {
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cache: HashMap::new(),
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fun,
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}
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}
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}
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impl<A, B> FnOnce<A> for CachedFun<A, B>
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//~^ ERROR type parameter to bare `FnOnce` trait must be a tuple
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where
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A: Eq + Hash + Clone,
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B: Clone,
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{
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type Output = B;
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extern "rust-call" fn call_once(mut self, a: A) -> Self::Output {
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//~^ ERROR functions with the "rust-call" ABI must take a single non-self tuple argument
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self.call_mut(a)
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//~^ ERROR `A` is not a tuple
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}
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}
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impl<A, B> FnMut<A> for CachedFun<A, B>
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//~^ ERROR type parameter to bare `FnMut` trait must be a tuple
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where
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A: Eq + Hash + Clone,
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B: Clone,
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{
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extern "rust-call" fn call_mut(&mut self, a: A) -> Self::Output {
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//~^ ERROR functions with the "rust-call" ABI must take a single non-self tuple argument
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self.cache.get(&a).map(|a| a.clone()).unwrap_or_else(|| {
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let b = (self.fun)(self, a.clone());
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self.cache.insert(a, b.clone());
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b
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})
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}
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}
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fn main() -> () {
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let pesce = |y: &mut CachedFun<i32, i32>, x| x + 1;
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let cachedcoso = CachedFun::new(pesce);
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cachedcoso.call_once(1);
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//~^ ERROR `i32` is not a tuple
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}
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