The use of operators pairs (=+ or =-) where the reversed, single operator was meant (+= or -=)
will compile and run, but not produce the expected results.
This rule raises an issue when =+ and =- are used without any space between the two operators and when there is at least
one whitespace after.
let target =-5; let num = 3; target =- num; // Noncompliant; target = -3. Is that really what's meant? target =+ num; // Noncompliant; target = 3
let target = -5; let num = 3; target = -num; // Compliant; intent to assign inverse value of num is clear target += num;