sql server - Incorrect syntax near 'THROW'

Question

IF @SQL IS NOT NULL
BEGIN
    BEGIN TRY 
        EXEC sp_executesql @SQL
        PRINT 'SUCCESS: ' + @SQL
    END TRY 
    BEGIN CATCH
        SET @ErrorMessage = 
                    N'Error dropping constraint' + @CRLF
                    + 'Table ' + @TableName + @CRLF
                    + 'Script: ' + @SQL + @CRLF
                    + 'Error message: ' + ERROR_MESSAGE() + @CRLF
        THROW  50100, @ErrorMessage, 1;
    END CATCH
END

When the CATCH executes, I get the following error:

Msg 102, Level 15, State 1, Line 257
Incorrect syntax near 'THROW'.

Replacing THROW with PRINT @ErrorMessage works.

Replacing @ErrorMessage variable with a literal string works.

According to the docs, however, THROW is supposed to be able to take a variable. Not sure what to make of this.

Answer 1

From MSDN:

The statement before the THROW statement must be followed by the semicolon (;) statement terminator.