wikimedia / mediawiki

		}

		$errors = [];

		if ( !$this->mTargetObj instanceof Title ) {

			$errors[] = $this->msg( 'mergehistory-invalid-source' )->parseAsBlock();

		} elseif ( !$this->mTargetObj->exists() ) {

			$errors[] = $this->msg( 'mergehistory-no-source',

				wfEscapeWikiText( $this->mTargetObj->getPrefixedText() )

			)->parseAsBlock();

		}

		if ( !$this->mDestObj instanceof Title ) {

			$errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();

			)->parseAsBlock();

		}

		if ( !$this->mDestObj instanceof Title ) {

			$errors[] = $this->msg( 'mergehistory-invalid-destination' )->parseAsBlock();

		} elseif ( !$this->mDestObj->exists() ) {

			$errors[] = $this->msg( 'mergehistory-no-destination',

				wfEscapeWikiText( $this->mDestObj->getPrefixedText() )

			)->parseAsBlock();

		}

		if ( $this->mTargetObj && $this->mDestObj && $this->mTargetObj->equals( $this->mDestObj ) ) {

			$errors[] = $this->msg( 'mergehistory-same-destination' )->parseAsBlock();