Class 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

Hierarchy (view full)

Constructors

constructor

Properties

ctx severity

Accessors

id kind shareImportedWarnings usesSouffle

Methods

check makeWarning skipUnused

Constructors

constructor

Properties

Readonlyctx

ctx: MistiContext

severity

severity: Severity = Severity.MEDIUM

Gets the severity of the detector.

Accessors

id

  • get id(): string

  • Gets the short identifier of the detector, used in analyzer warnings.

    Returns string

    The unique identifier of the detector.

kind

shareImportedWarnings

  • get shareImportedWarnings(): WarningsBehavior

  • Defines the behavior of warnings generated by this detector when working with multiple projects within a single Tact configuration.

    Here are the available options:

    1. "union" Leave this value if you don't care about warnings generated in other projects.
    2. "intersect" If the warning is generated for some source location of the imported file, it should be generated by each of the projects. Example: Constants from an imported file should not be reported iff they are unused in all the projects, so you need "intersect".

    Returns WarningsBehavior

usesSouffle

  • get usesSouffle(): boolean

  • Checks whether this detector needs the Soufflé binary to be executed.

    Returns boolean

Methods

check

ProtectedmakeWarning

ProtectedskipUnused

Settings

Member Visibility

On This Page

Why is it bad?Example
Constructors
Properties
Accessors
Methods