Fix: crash with function_clause when io:format on binary #2079
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Elixir users, and presumably various AI, and Editors
has a tendency to inadvertently call io:format
with an Elixir string eg a binary:
:io.format("----->create_net: ok, ip_info=~p~n", [ip_info])
Which crashes, with function_clause error..
This allows the binary, as the underlying
io_lib:format(Format, Args) handles the Format
being a binary
https://github.com/atomvm/AtomVM/blob/887e71a98f28df52e6d6f41d344cad685092cf2b/libs/estdlib/src/io_lib.erl#L74
Also fixes the spec, including return spec since
put_chars/2 returns ok
Fixes atomvm#2078
- see issue for confusing error/Crash
Signed-off-by: Peter M <petermm@gmail.com>
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bettio
approved these changes
Jan 29, 2026
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Elixir users, and presumably various AI, and editors
has a tendency to inadvertently call io:format
with an Elixir string eg a binary:
:io.format("----->create_net: ok, ip_info=~p~n", [ip_info])Which crashes, with function_clause error..
This allows the binary, as the underlying
io_lib:format(Format, Args) handles the Format
being a binary
AtomVM/libs/estdlib/src/io_lib.erl
Line 74 in 887e71a
Also fixes the spec, including return spec since
put_chars/2 returns ok
Fixes #2078
These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).
SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later