error[E0596]: cannot borrow `*rofl` as mutable, as it is behind a `&` reference
  --> $DIR/issue-85765.rs:6:5
   |
LL |     rofl.push(Vec::new());
   |     ^^^^ `rofl` is a `&` reference, so the data it refers to cannot be borrowed as mutable
   |
help: you can `clone` the `Vec<Vec<i32>>` value and consume it, but this might not be your desired behavior
  --> $DIR/issue-85765.rs:3:32
   |
LL |     let rofl: &Vec<Vec<i32>> = &mut test;
   |                                ^^^^^^^^^
help: consider changing this binding's type
   |
LL |     let rofl: &mut Vec<Vec<i32>> = &mut test;
   |               ~~~~~~~~~~~~~~~~~~

error[E0594]: cannot assign to `*r`, which is behind a `&` reference
  --> $DIR/issue-85765.rs:13:5
   |
LL |     *r = 0;
   |     ^^^^^^ `r` is a `&` reference, so the data it refers to cannot be written
   |
help: consider changing this to be a mutable reference
   |
LL |     let r = &mut mutvar;
   |              +++

error[E0594]: cannot assign to `*x`, which is behind a `&` reference
  --> $DIR/issue-85765.rs:20:5
   |
LL |     *x = 1;
   |     ^^^^^^ `x` is a `&` reference, so the data it refers to cannot be written
   |
help: consider changing this binding's type
   |
LL |     let x: &mut usize = &mut{0};
   |            ~~~~~~~~~~

error[E0594]: cannot assign to `*y`, which is behind a `&` reference
  --> $DIR/issue-85765.rs:27:5
   |
LL |     *y = 1;
   |     ^^^^^^ `y` is a `&` reference, so the data it refers to cannot be written
   |
help: consider changing this binding's type
   |
LL |     let y: &mut usize = &mut(0);
   |            ~~~~~~~~~~

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0594, E0596.
For more information about an error, try `rustc --explain E0594`.