🚀 go-pugleaf

The requirement for a 'main' can NOT be built into the compiler because
a program can be split into seperatly compilable source modules.  When
compiling any given module there is no way of determining if it is the
one and only module in the program that contains 'main'.  At best the
requirement for a 'main' is a requirement on the linker.

Actually requiring a program to have a 'main' may be a problem.  What
should probably be required is a capability to have a 'main' but allow
other mechanisms that produce a comparable effect.  (No, I have no idea
how to phrase that.)

There are other extensions to be considered.  A number of UNIX based
systems allow an 'envp' as a third argument.  This seems to imply that
'main' is quite different from other C++ functions that overload on the
number and type of its arguments.  In fact, it is much closer to a 'C'
style function in its ability to handle a variable number of arguments.

        Max
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