Rollup merge of rust-lang#92389 - chordtoll:test-92015, r=Mark-Simula…

…crum

Regression test for borrowck ICE rust-lang#92015

This issue has come up a few times. Creating a regression test.
Closes rust-lang#92015.

src/test/ui/borrowck/issue-92015.rs

@@ -0,0 +1,7 @@
+// Regression test for #92105.
+// ICE when mutating immutable reference from last statement of a block.
+
+fn main() {
+ let foo = Some(&0).unwrap();
+ *foo = 1; //~ ERROR cannot assign
+}

src/test/ui/borrowck/issue-92015.stderr

@@ -0,0 +1,11 @@
+error[E0594]: cannot assign to `*foo`, which is behind a `&` reference
+ --> $DIR/issue-92015.rs:6:5
+ |
+LL | let foo = Some(&0).unwrap();
+ | --- help: consider changing this to be a mutable reference: `&mut i32`
+LL | *foo = 1;
+ | ^^^^^^^^ `foo` is a `&` reference, so the data it refers to cannot be written
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0594`.