L-values vs. Yacc and Lex for 11/12/84 draft of ANSI C

[Howard Johnson]

There is a deficiency in the Yacc/Lex grammar for the 11/12/84 draft of
ANSI C posted to mod.sources recently.  It has to do with the concept of
l-values, namely:  statements such as those shown below which are given
to the parser do not generate syntax errors, requiring semantic
interpretation to flag these errors.

	main()
	{
		char *foo;

		foo = "hello, world"++;
		sizeof(int) = 3;
	}

Now I personally would not like to see increment/decrement operators
used legitimately on arbitrary r-values, as this would affect the
semantic meaning of those operators.

The rest of the grammar seems to be all right; there is just one
intentional shift/reduce conflict with the dangling-else construct
of C, and no dependence on %prec declarations.  L-values shouldn't
be hard to add to the grammar.

Having the lexical analyzer ignore spurious characters (such as '$')
seems peculiar, but that is another subject.