mirror of https://github.com/rust-lang/rust
29 lines
971 B
Rust
29 lines
971 B
Rust
// Whenever a `StorageDead` MIR statement destroys a value `x`,
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// we should kill all loans of `x`. This is extracted from `rand 0.4.6`,
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// is correctly accepted by NLL but was incorrectly rejected by
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// Polonius because of these missing `killed` facts.
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//@ check-pass
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//@ compile-flags: -Z polonius
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use std::{io, mem};
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use std::io::Read;
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#[allow(dead_code)]
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fn fill(r: &mut dyn Read, mut buf: &mut [u8]) -> io::Result<()> {
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while buf.len() > 0 {
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match r.read(buf).unwrap() {
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0 => return Err(io::Error::new(io::ErrorKind::Other,
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"end of file reached")),
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n => buf = &mut mem::replace(&mut buf, &mut [])[n..],
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// ^- Polonius had multiple errors on the previous line (where NLL has none)
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// as it didn't know `buf` was killed here, and would
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// incorrectly reject both the borrow expression, and the assignment.
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}
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}
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Ok(())
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}
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fn main() {
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}
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