28 lines
920 B
Rust
28 lines
920 B
Rust
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// Verify that lifetime resolution correctly accounts for `Fn` bare trait objects.
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#![allow(bare_trait_objects)]
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// This should work as: fn next_u32(fill_buf: &mut dyn FnMut(&mut [u8]))
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fn next_u32(fill_buf: &mut FnMut(&mut [u8])) {
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let mut buf: [u8; 4] = [0; 4];
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fill_buf(&mut buf);
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}
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fn explicit(fill_buf: &mut dyn FnMut(&mut [u8])) {
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let mut buf: [u8; 4] = [0; 4];
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fill_buf(&mut buf);
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}
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fn main() {
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let _: fn(&mut FnMut(&mut [u8])) = next_u32;
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//~^ ERROR mismatched types
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let _: &dyn Fn(&mut FnMut(&mut [u8])) = &next_u32;
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let _: fn(&mut FnMut(&mut [u8])) = explicit;
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//~^ ERROR mismatched types
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let _: &dyn Fn(&mut FnMut(&mut [u8])) = &explicit;
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let _: fn(&mut dyn FnMut(&mut [u8])) = next_u32;
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let _: &dyn Fn(&mut dyn FnMut(&mut [u8])) = &next_u32;
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let _: fn(&mut dyn FnMut(&mut [u8])) = explicit;
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let _: &dyn Fn(&mut dyn FnMut(&mut [u8])) = &explicit;
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}
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