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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/borrowck/two-phase-sneaky.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/borrowck/two-phase-sneaky.rs')
-rw-r--r-- | src/test/ui/borrowck/two-phase-sneaky.rs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/two-phase-sneaky.rs b/src/test/ui/borrowck/two-phase-sneaky.rs new file mode 100644 index 000000000..bf06366de --- /dev/null +++ b/src/test/ui/borrowck/two-phase-sneaky.rs @@ -0,0 +1,15 @@ +// This is the first counter-example from Niko's blog post +// smallcultfollowing.com/babysteps/blog/2017/03/01/nested-method-calls-via-two-phase-borrowing/ +// of a danger for code to crash if we just turned off the check for whether +// a mutable-borrow aliases another borrow. + +fn main() { + let mut v: Vec<String> = vec![format!("Hello, ")]; + v[0].push_str({ + + v.push(format!("foo")); + //~^ ERROR cannot borrow `v` as mutable more than once at a time [E0499] + + "World!" + }); +} |