Why is this an issue?
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 =+, =-, or =! is used without any spacing between the two operators and when
there is at least one whitespace character after.
Noncompliant code example
var target = -5
val num = 3
target =- num // Noncompliant; target = -3. Is that really what's meant?
target =+ num // Noncompliant; target = 3
Compliant solution
var target = -5
val num = 3
target = -num // Compliant; intent to assign inverse value of num is clear
target += num
