From 218caa410aa38c29984be31a5229b9fa717560ee Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 14:19:13 +0200
Subject: Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../borrow-immutable-upvar-mutation.stderr         | 87 ++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 tests/ui/borrowck/borrow-immutable-upvar-mutation.stderr

(limited to 'tests/ui/borrowck/borrow-immutable-upvar-mutation.stderr')

diff --git a/tests/ui/borrowck/borrow-immutable-upvar-mutation.stderr b/tests/ui/borrowck/borrow-immutable-upvar-mutation.stderr
new file mode 100644
index 000000000..a0eaf1f16
--- /dev/null
+++ b/tests/ui/borrowck/borrow-immutable-upvar-mutation.stderr
@@ -0,0 +1,87 @@
+error[E0594]: cannot assign to `x`, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:21:27
+   |
+LL | fn to_fn<A: std::marker::Tuple, F: Fn<A>>(f: F) -> F {
+   |                                              - change this to accept `FnMut` instead of `Fn`
+...
+LL |         let _f = to_fn(|| x = 42);
+   |                  ----- -- ^^^^^^ cannot assign
+   |                  |     |
+   |                  |     in this closure
+   |                  expects `Fn` instead of `FnMut`
+
+error[E0596]: cannot borrow `y` as mutable, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:24:31
+   |
+LL | fn to_fn<A: std::marker::Tuple, F: Fn<A>>(f: F) -> F {
+   |                                              - change this to accept `FnMut` instead of `Fn`
+...
+LL |         let _g = to_fn(|| set(&mut y));
+   |                  ----- --     ^^^^^^ cannot borrow as mutable
+   |                  |     |
+   |                  |     in this closure
+   |                  expects `Fn` instead of `FnMut`
+
+error[E0594]: cannot assign to `z`, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:29:22
+   |
+LL | fn to_fn<A: std::marker::Tuple, F: Fn<A>>(f: F) -> F {
+   |                                              - change this to accept `FnMut` instead of `Fn`
+...
+LL |             to_fn(|| z = 42);
+   |             ----- -- ^^^^^^ cannot assign
+   |             |     |
+   |             |     in this closure
+   |             expects `Fn` instead of `FnMut`
+
+error[E0594]: cannot assign to `x`, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:36:32
+   |
+LL | fn to_fn<A: std::marker::Tuple, F: Fn<A>>(f: F) -> F {
+   |                                              - change this to accept `FnMut` instead of `Fn`
+...
+LL |         let _f = to_fn(move || x = 42);
+   |                  ----- ------- ^^^^^^ cannot assign
+   |                  |     |
+   |                  |     in this closure
+   |                  expects `Fn` instead of `FnMut`
+
+error[E0596]: cannot borrow `y` as mutable, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:39:36
+   |
+LL | fn to_fn<A: std::marker::Tuple, F: Fn<A>>(f: F) -> F {
+   |                                              - change this to accept `FnMut` instead of `Fn`
+...
+LL |         let _g = to_fn(move || set(&mut y));
+   |                  ----- -------     ^^^^^^ cannot borrow as mutable
+   |                  |     |
+   |                  |     in this closure
+   |                  expects `Fn` instead of `FnMut`
+
+error[E0594]: cannot assign to `z`, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:44:27
+   |
+LL | fn to_fn<A: std::marker::Tuple, F: Fn<A>>(f: F) -> F {
+   |                                              - change this to accept `FnMut` instead of `Fn`
+...
+LL |             to_fn(move || z = 42);
+   |             ----- ------- ^^^^^^ cannot assign
+   |             |     |
+   |             |     in this closure
+   |             expects `Fn` instead of `FnMut`
+
+error[E0594]: cannot assign to `x`, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation.rs:53:9
+   |
+LL | fn foo() -> Box<dyn Fn() -> usize> {
+   |    ---      ---------------------- change this to return `FnMut` instead of `Fn`
+LL |     let mut x = 0;
+LL |     Box::new(move || {
+   |              ------- in this closure
+LL |         x += 1;
+   |         ^^^^^^ cannot assign
+
+error: aborting due to 7 previous errors
+
+Some errors have detailed explanations: E0594, E0596.
+For more information about an error, try `rustc --explain E0594`.
-- 
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