Scaffolding:  (Tested in scaffold.c)

Child uses temp?	Child complex?		Parent has tests?
Y			Y			Y
Y			Y			N
Y			N			Y
Y			N			N
N			Y			Y
N			Y			N
N			N			Y
N			N			N

(These tests should check whether instrumentation can be turned off
for each of the types.)



Other tests:  the obvious tests of the probes, using the following
combinations:


In all cases where substitutions are possible, provide possible variables
of following types:
	Float.
	Pointer.

Argument type (where applicable)
	Pointer
	integer
	float
	pointer cast into int.
	float cast into int.

	
No tests for unary plus, since some C compilers don't accept it.
