error[E0595]: closure cannot assign to immutable local variable `tick1`
  --> $DIR/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs:26:17
   |
LL |     let tick1 = || {
   |         ----- help: make this binding mutable: `mut tick1`
...
LL |     let tick2 = || { //~ ERROR closure cannot assign to immutable local variable `tick1`
   |                 ^^ cannot borrow mutably

error[E0596]: cannot borrow immutable local variable `tick2` as mutable
  --> $DIR/unboxed-closures-infer-fnmut-calling-fnmut-no-mut.rs:30:5
   |
LL |     let tick2 = || { //~ ERROR closure cannot assign to immutable local variable `tick1`
   |         ----- help: make this binding mutable: `mut tick2`
...
LL |     tick2(); //~ ERROR cannot borrow
   |     ^^^^^ cannot borrow mutably

error: aborting due to 2 previous errors

Some errors occurred: E0595, E0596.
For more information about an error, try `rustc --explain E0595`.