From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:19:13 +0200 Subject: Merging upstream version 1.68.2+dfsg1. Signed-off-by: Daniel Baumann --- .../borrowck-mut-borrow-of-mut-base-ptr.rs | 28 ++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 tests/ui/borrowck/borrowck-mut-borrow-of-mut-base-ptr.rs (limited to 'tests/ui/borrowck/borrowck-mut-borrow-of-mut-base-ptr.rs') diff --git a/tests/ui/borrowck/borrowck-mut-borrow-of-mut-base-ptr.rs b/tests/ui/borrowck/borrowck-mut-borrow-of-mut-base-ptr.rs new file mode 100644 index 000000000..6174893ba --- /dev/null +++ b/tests/ui/borrowck/borrowck-mut-borrow-of-mut-base-ptr.rs @@ -0,0 +1,28 @@ +// Test that attempt to mutably borrow `&mut` pointer while pointee is +// borrowed yields an error. +// +// Example from compiler/rustc_borrowck/borrowck/README.md + + + +fn foo<'a>(mut t0: &'a mut isize, + mut t1: &'a mut isize) { + let p: &isize = &*t0; // Freezes `*t0` + let mut t2 = &mut t0; //~ ERROR cannot borrow `t0` + **t2 += 1; // Mutates `*t0` + p.use_ref(); +} + +fn bar<'a>(mut t0: &'a mut isize, + mut t1: &'a mut isize) { + let p: &mut isize = &mut *t0; // Claims `*t0` + let mut t2 = &mut t0; //~ ERROR cannot borrow `t0` + **t2 += 1; // Mutates `*t0` but not through `*p` + p.use_mut(); +} + +fn main() { +} + +trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { } } +impl Fake for T { } -- cgit v1.2.3