UnusedExpressionResult

A detector that identifies expression statements whose result is unused.

Why is it bad?

Expression statements that don't alter the contract's state and whose results are not used can lead to inefficiency, dead code, and potential confusion. They add unnecessary complexity without contributing to the logic or state of the contract.

Example

self.foo == 3; // Warning: unused boolean expression
inc(a); // Warning: unused return value

Use instead:

self.foo = 3; // Fixed: corrected assignment
newValue = inc(a); // OK: result is now used
let _ = inc(a); // OK: explicitly ignored