After looking more at this, I remembered there was a reason for this.

Basically, lets take this script:

DECLARE @Command nvarchar(4000)

SET @Command = N'DROP INDEX [NoClient] ON [Invoice]'
PRINT @Command

This would work to replace it with this:

DECLARE @Command nvarchar(4000)

SET @Command = N'DROP INDEX [NoClient] ON [Invoice]'
Raiserror(@Command,0,1) With Nowait

But, I need this:

DECLARE @Command nvarchar(4000)

SET @Command = N'DROP INDEX [NoClient] ON [Invoice]'
Raiserror(@Command+'...',0,1) With Nowait

And, this does not work. It seems Raiserror() has no support for concatenation with such syntax.

Also, more complex lines like this:

PRINT 'Processing Report at '+convert(varchar,datepart(hour,getdate()))+':'+
 RIGHT(REPLICATE('0',2)+convert(varchar,datepart(minute,getdate())),2)+':'+
 RIGHT(REPLICATE('0',2)+convert(varchar,datepart(second,getdate())),2)+'...'

Will not work when being converted to this:

Raiserror('Processing Report at '+convert(varchar,datepart(hour,getdate()))+':'+
 RIGHT(REPLICATE('0',2)+convert(varchar,datepart(minute,getdate())),2)+':'+
 RIGHT(REPLICATE('0',2)+convert(varchar,datepart(second,getdate())),2)+'...',0,1) With Nowait