Joshua Landau added the comment:
I imagine it like (in the map unpacking code)
func_offset = (oparg >> 8) & 0xFF;
num_maps = oparg & 0xFF;
// later
if (func_offset) {
// do checks
if (repeated_argument) {
raise_error_from_function(PEEK(func_offset + num_maps));
}
}
This code should be relatively quick, in an already-slow opcode, and rather
short.
If adding to CALL_FUNCTION_XXX, you would have to add an EXTENDED_ARG opcode
(because CALL_FUNCTION_XXX already uses the bottom 16 bits), add checks for the
top bits in the opcode, duplicate the (large) dictionary merging function. This
doesn't seem like it saves much work.
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<http://bugs.python.org/issue2292>
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