GNU Smalltalk Library Reference: SystemExceptions.MustBeBoolean

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1.175 SystemExceptions.MustBeBoolean

Defined in namespace Smalltalk.SystemExceptions
Superclass: SystemExceptions.WrongClass
Category: Language-Exceptions: I am raised when one invokes a boolean method on a non-boolean.

• SystemExceptions.MustBeBoolean class-signaling: (class)