rust/src/test/compile-fail/borrowck-swap-mut-base-ptr.rs
Alex Crichton 3585c64d09 rustdoc: Change all code-blocks with a script
find src -name '*.rs' | xargs sed -i '' 's/~~~.*{\.rust}/```rust/g'
    find src -name '*.rs' | xargs sed -i '' 's/ ~~~$/ ```/g'
    find src -name '*.rs' | xargs sed -i '' 's/^~~~$/ ```/g'
2013-09-25 14:27:42 -07:00

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Rust

// Test that attempt to swap `&mut` pointer while pointee is borrowed
// yields an error.
//
// Example from src/middle/borrowck/doc.rs
use std::util::swap;
fn foo<'a>(mut t0: &'a mut int,
mut t1: &'a mut int) {
let p: &int = &*t0; // Freezes `*t0`
swap(&mut t0, &mut t1); //~ ERROR cannot borrow `t0`
*t1 = 22;
}
fn main() {
}