method-combination-error (ANSI and GNU Common Lisp Document)

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#### 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