37 lines
1.1 KiB
Rust
37 lines
1.1 KiB
Rust
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// General test of maybe_uninits state computed by MIR dataflow.
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#![feature(rustc_attrs)]
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#![feature(stmt_expr_attributes)]
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use std::intrinsics::rustc_peek;
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use std::mem::{drop, replace};
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struct S(i32);
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#[rustc_mir_borrowck]
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#[rustc_mir(rustc_peek_maybe_uninit,stop_after_dataflow,borrowck_graphviz_postflow="/tmp/uninits-2.dot")]
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fn foo(x: &mut S) {
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// `x` is initialized here, so maybe-uninit bit is 0.
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unsafe { *rustc_peek(&x) }; //~ ERROR rustc_peek: bit not set
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::std::mem::drop(x);
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// `x` definitely uninitialized here, so maybe-uninit bit is 1.
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unsafe { rustc_peek(&x) };
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}
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fn main() {
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foo(&mut S(13));
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foo(&mut S(13));
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}
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