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There are 8 error identifiers in the callable.* group:

• Callable references a method that is not accessible from the current scope.

• Unnecessary (void) cast on a callable that already allows discarding its return value.

• Non-callable expression is invoked as a function.

• First-class callable syntax is not supported on the configured PHP version.

• Return value of a callable that requires its result to be used is discarded.

• Generic callable type shadows a template type from the enclosing class or function.

• Return type of a callable call contains an unresolvable type after template substitution.

• Return value of a void-returning callable is used.