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, but ignores the operators when they're spaced out: = + and = -.

Noncompliant Code Example

var target =-5;
var num = 3;

target =- num;  // Noncompliant; target = -3. Is that really what's meant?
target =+ num; // Noncompliant; target = 3

Compliant Solution

var target = -5;
var num = 3;

target = -num;  // Compliant; intent to assign inverse value of num is clear
target += num;