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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
// SPDX-License-Identifier: Apache-2.0 OR MIT | ||
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// Check that we can codegen various nesting structures of boxes and | ||
// pointer to closures. | ||
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// FIXME: several cases fail because we need to "retuple" closures, | ||
// see: https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Determine.20untupled.20closure.20args.20from.20Instance.3F | ||
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fn main() { | ||
// Create a nested boxed once-callable closure | ||
let f: Box<Box<dyn FnOnce(i32)>> = Box::new(Box::new(|x| assert!(x == 1))); | ||
f(1); | ||
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// Create a pointer to a closure | ||
let g = |y| assert!(y == 2); | ||
let p: &dyn Fn(i32) = &g; | ||
p(2); | ||
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// Additional level of pointer nesting | ||
let q: &dyn Fn(i32) = &p; | ||
q(2); | ||
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// Create a boxed pointer to a closure | ||
let r: Box<&dyn Fn(i32)> = Box::new(&g); | ||
r(2); | ||
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// Another boxed box | ||
let s: Box<Box<dyn Fn(i32)>> = Box::new(Box::new(|x| assert!(x == 3))); | ||
s(3); | ||
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// A pointer to the boxed box | ||
let t: &Box<Box<dyn Fn(i32)>> = &s; | ||
t(3); | ||
} |