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Mismatched variable type

Reports instance and class variable assignments whose inferred types don't match the variable's expected type. The expected variable type is taken from the RBS type signature.

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.

RubyMismatchedVariableType
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 | Ruby | Probable bugs

Inspection ID: RubyMismatchedVariableType

Inspection options

Here you can find the description of settings available for the Mismatched variable type inspection, and the reference of their default values.

Check types from RBS

Option ID:

RubyExpectedTypeProvider.RbsRubyExpectedVariableTypeProvider

Default value:

Selected
Check nilability

Option ID:

myCheckNilability

Default value:

Selected

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 RubyMismatchedVariableType

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

Inspection Details

By default bundled with:

Qodana for Ruby 2025.2, RubyMine 2025.2,

Last modified: 18 September 2025