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29 lines
892 B
Rust
29 lines
892 B
Rust
// run-pass
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// #11303, #11040:
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// This would previously crash on i686 Linux due to abi differences
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// between returning an Option<T> and T, where T is a non nullable
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// pointer.
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// If we have an enum with two variants such that one is zero sized
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// and the other contains a nonnullable pointer, we don't use a
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// separate discriminant. Instead we use that pointer field to differentiate
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// between the 2 cases.
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// Also, if the variant with the nonnullable pointer has no other fields
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// then we simply express the enum as just a pointer and not wrap it
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// in a struct.
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use std::mem;
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#[inline(never)]
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extern "C" fn foo(x: &isize) -> Option<&isize> { Some(x) }
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static FOO: isize = 0xDEADBEE;
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pub fn main() {
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unsafe {
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let f: extern "C" fn(&isize) -> &isize =
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mem::transmute(foo as extern "C" fn(&isize) -> Option<&isize>);
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assert_eq!(*f(&FOO), FOO);
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}
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}
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