Redundant upper bound 'Any?'

Reports redundant explicit upper bound Any? on a type parameter. In Kotlin, the default upper bound for type parameters is Any?, so specifying it explicitly is unnecessary.

Examples:

// Before
fun <T : Any?> foo(t: T) {}
class C<T : Any?>

After the quick-fix is applied:

fun <T> foo(t: T) {}
class C<T>

The quick fix removes the redundant upper bound and the preceding colon.

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.

RedundantUpperBound

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 | Kotlin | Redundant constructs

Inspection ID: RedundantUpperBound

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 RedundantUpperBound

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

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025