What default promotions of types are there in the variadic arguments list?

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Look in the draft n1256 (C99 with Technical corrigenda TC1, TC2, and TC3 included) for 6.5.2.2 Function calls:

For functions without prototype, or parameters corresponding to the ellipsis ..., the default argument promotions are performed.

Those are: Default integer promotions and promotion of float to double.

Default integer promotions: Every integer type of rank less than int is promoted to int or unsigned int.

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