Unused type variable

Reports container, method, and type alias type variables that are unused within the project.

Container type variables are only checked if the container has exactly one declaration.

A quick fix is available to remove the unused type variable.

Example:

# Type variable 'A' of class 'Example' is unused
class Example[A]
end

After the quick fix:

class Example
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.

RbsUnusedTypeVariable

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 | Data flow

Inspection ID: RbsUnusedTypeVariable

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 RbsUnusedTypeVariable

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