>Here's my code that breaks.
>x="1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456"
>
>That's 256 characters in the definition of a memory variable.
>Not sure why this is breaking.

Try it this way:

x = "12345678901234567890123456789012345678901234567890123456789012345678901234567890"
x = x + "1234567890123456789012345678901234567890123456789012345678901234567890"
x = x + "1234567890123456789012345678901234567890123456789012345678901234567890"
x = x + "123456789012345678901234567890123456"

or this way:

X = "12345678901234567890123456789012345678901234567890123456789012345678901234567890" + ;
       "12345678901234567890123456789012345678901234567890123456789012345678901234567890" +;
       "12345678901234567890123456789012345678901234567890123456789012345678901234567890" +;
       "1234567890123456"

The problem might be that you are limited to a length of 256 characters in a single line and the x="" characters are adding to the character count per line.