Incorrect type argument variance

Reports type arguments used in an inheritance statement (a superclass clause, self-type, or an inclusion call) which have incorrect variances. Type arguments passed to an inheritance statement must match in variance with the declaring type variable.

Example:

module Enumerable[unchecked out A]
end

class Example[in A]
  # Contravariant type variable 'A' of class 'Example' used as a covariant argument
  include Enumerable[A]
end

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

RbsIncorrectTypeArgumentVariance

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | RBS | Probable bugs

Inspection ID: RbsIncorrectTypeArgumentVariance

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection RbsIncorrectTypeArgumentVariance

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

RubyMine 2025.2

Inspection Details
By default bundled with:	Qodana for Ruby 2025.2, RubyMine 2025.2,

Last modified: 18 September 2025