[erlang-patches] Add ei_x_vformat to erl_interface library

[David Cabrero]

Hello,

I'd like to submit this patch to add two new functions to the erl_interface
library.

Repo branch: https://github.com/cabrero/otp/tree/add_ei_x_vformat

Compare:
https://github.com/cabrero/otp/compare/erlang:master...add_ei_x_vformat


Why this new feature?

*It allows to write **functions that take a variable number of arguments
and use ei_x_format
*
 <https://github.com/erlang/otp/wiki/Eeplight#risks--uncertain-artifacts>Risks
/ uncertain artifacts

*None*
 <https://github.com/erlang/otp/wiki/Eeplight#how-did-you-solve-it>How did
you solve it?Adding new functions like printf vs vprintf



Thanks.

-- David
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