Cannot Mutably Borrow Immutable

A mutable reference was requested for a variable that was not declared as mutable. Add the mut keyword to the variable's declaration to allow mutable borrowing.

References

doc.rust-lang.org/error_codes/E0596.html

In this namespace

← previous E0594 Assign to Immutable Variable next → E0597 Value Dropped While Borrowed

E0516 E0517 E0560 E0562 E0594 E0596 E0597 E0599 E0601 E0603 E0605