#### 9.2.16 method-combination-error [Function] ¶

`method-combination-error` format-control &rest args ⇒ implementation-dependent

#### Arguments and Values:: ¶

format-control—a format control.

args—format arguments for format-control.

#### Description:: ¶

The function method-combination-error is used to signal an error in method combination.

The error message is constructed by using a format-control suitable for format and any args to it. Because an implementation may need to add additional contextual information to the error message, method-combination-error should be called only within the dynamic extent of a method combination function.

Whether method-combination-error returns to its caller or exits via throw is implementation-dependent.

#### Side Effects:: ¶

The debugger might be entered.

#### Affected By:: ¶

*break-on-signals*

#### See Also:: ¶

define-method-combination [Macro]