Inspectopedia 2025.2 Help

Ambiguous unary operator use with number constant

Reports an unary operator followed by a dot qualifier such as -1.inc().

Code like -1.inc() can be misleading because - has a lower precedence than .inc(). As a result, -1.inc() evaluates to -2 and not 0 as it might be expected.

Wrap unary operator and value with () quick-fix can be used to amend the code automatically.

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.

WrapUnaryOperator
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 | Probable bugs

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 WrapUnaryOperator

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:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025