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Two other syntactic symbols can appear in old style, non-prototyped C code 43:
1: int add_three_integers(a, b, c)
2: int a;
3: int b;
4: int c;
5: {
6: return a + b + c;
7: }
Here, line 2 is the first line in an argument declaration list and so is
given the knr-argdecl-intro syntactic symbol. Subsequent lines
(i.e., lines 3 and 4 in this example), are given knr-argdecl
syntax.