Side effect with string buffer and function calls

Language reference ›› Procedures and functions ››
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In processors smaller than PIC18, PMP uses only one string temporary buffer for space reduction.

In another side, there's no stack where to save a string buffer.

In this context there is a special side effect when there is a function call in a string expression if there is also a string expression in the called function.

Consider the following code:

FUNCTION Func1: string;
   // assume that Var1 contains #13
   Func1 := '-foo' + Var1 + 'bar-';

StringVar := 'hello' + Func1 + 'world';

StringVar will contain '-foo' + #13 + 'bar-' + 'world' because 'hello' was pushed in the string buffer and the string buffer has been destroyed in the Func1 function.