mirror of https://github.com/rust-lang/rust
26 lines
593 B
Rust
26 lines
593 B
Rust
//@ run-pass
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// This code used to produce the following ICE:
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//
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// error: internal compiler error: get_unique_type_id_of_type() -
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// unexpected type: closure,
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// Closure(rustc_ast::DefId{krate: 0, node: 66},
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// ReScope(63))
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//
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// This is a regression test for issue #17021.
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//
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//@ compile-flags: -g
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use std::ptr;
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pub fn replace_map<'a, T, F>(src: &mut T, prod: F) where F: FnOnce(T) -> T {
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unsafe { *src = prod(ptr::read(src as *mut T as *const T)); }
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}
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pub fn main() {
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let mut a = 7;
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let b = &mut a;
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replace_map(b, |x: usize| x * 2);
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assert_eq!(*b, 14);
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}
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