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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/borrow-immutable-upvar-mutation.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/borrow-immutable-upvar-mutation.rs')
-rw-r--r-- | src/test/ui/borrowck/borrow-immutable-upvar-mutation.rs | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/borrow-immutable-upvar-mutation.rs b/src/test/ui/borrowck/borrow-immutable-upvar-mutation.rs new file mode 100644 index 000000000..e2f016614 --- /dev/null +++ b/src/test/ui/borrowck/borrow-immutable-upvar-mutation.rs @@ -0,0 +1,56 @@ +#![feature(unboxed_closures)] + +// Tests that we can't assign to or mutably borrow upvars from `Fn` +// closures (issue #17780) + +fn set(x: &mut usize) { + *x = 5; +} + +fn to_fn<A, F: Fn<A>>(f: F) -> F { + f +} +fn to_fn_mut<A, F: FnMut<A>>(f: F) -> F { + f +} + +fn main() { + // By-ref captures + { + let mut x = 0; + let _f = to_fn(|| x = 42); //~ ERROR cannot assign + + let mut y = 0; + let _g = to_fn(|| set(&mut y)); //~ ERROR cannot borrow + + let mut z = 0; + let _h = to_fn_mut(|| { + set(&mut z); + to_fn(|| z = 42); //~ ERROR cannot assign + }); + } + + // By-value captures + { + let mut x = 0; + let _f = to_fn(move || x = 42); //~ ERROR cannot assign + + let mut y = 0; + let _g = to_fn(move || set(&mut y)); //~ ERROR cannot borrow + + let mut z = 0; + let _h = to_fn_mut(move || { + set(&mut z); + to_fn(move || z = 42); + //~^ ERROR cannot assign + }); + } +} + +fn foo() -> Box<dyn Fn() -> usize> { + let mut x = 0; + Box::new(move || { + x += 1; //~ ERROR cannot assign + x + }) +} |