I am a little stuck of a question.

In fmgr.c:1698, function "InputFunctionCall" at line 1718

/* Should get null result if and only if str is NULL */
if (str == NULL)

What are we testing to be NULL here?
Do we expect str to changed at line 1715 
(  result = FunctionCallInvoke(&fcinfo);  )

Please advice,

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