misc-redundant-expression

Detect redundant expressions which are typically errors due to copy-paste.

Depending on the operator expressions may be

• redundant,
• always true,
• always false,
• always a constant (zero or one).

Examples:

((x+1) | (x+1))             // (x+1) is redundant
(p->x == p->x)              // always true
(p->x < p->x)               // always false
(speed - speed + 1 == 12)   // speed - speed is always zero