license docs-private export function throwMatMenuMissingError ( ) { throw Error ( `matMenuTriggerFor: must pass in an mat-menu instance.

    Example:
      <mat-menu #menu="matMenu"></mat-menu>
      <button [matMenuTriggerFor]="menu"></button>` ) ; } docs-private export function throwMatMenuInvalidPositionX ( ) { throw Error ( `xPosition value must be either 'before' or after'.
      Example: <mat-menu xPosition="before" #menu="matMenu"></mat-menu>` ) ; } docs-private export function throwMatMenuInvalidPositionY ( ) { throw Error ( `yPosition value must be either 'above' or below'.
      Example: <mat-menu yPosition="above" #menu="matMenu"></mat-menu>` ) ; }