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Impossible interface type assertion

Reports impossible interface-to-interface type assertions.

Checks for type assertions v.(T) and corresponding type-switch cases in which the static type V of v is the interface that cannot possibly implement the target interface T. This occurs when V and T contain methods with the same name but different signatures.


var v interface { Read() } _ = v.(io.Reader)

The Read method in v has a different signature than the Read method in io.Reader, so this assertion cannot succeed.

Locating this inspection


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

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 | Go | Probable bugs

This inspection only reports if the language version is 1.15 or higher.


By default bundled with

GoLand 2024.1, Qodana for Go 2024.1,

Can be installed with plugin


Last modified: 18 June 2024