Encoding error during compilation depends on .proto filename

[rpinmanc]

Hello. I'm experiencing a very strange error and I can't figure out where it's coming from.

When compiling a proto file named 'n1_n2.proto', I get an encoding error:

$> protoc --elixir_out=gen_descriptors=true:compiled_protos n1_n2.proto
** (RuntimeError) reading from :stdio failed: {:error, {:no_translation, :unicode, :latin1}}
    (protobuf 0.15.0) lib/protobuf/protoc/cli.ex:234: Protobuf.Protoc.CLI.binread_all!/1
  
    (protobuf 0.15.0) lib/protobuf/protoc/cli.ex:45: Protobuf.Protoc.CLI.main/1
    (elixir 1.18.2) lib/kernel/cli.ex:137: anonymous fn/3 in Kernel.CLI.exec_fun/2
--elixir_out: protoc-gen-elixir: Plugin failed with status code 1.

But if I rename the same file to 'n1_n2_conv.proto', it compiles successfully:

$> mv n1_n2.proto n1_n2_conv.proto
$> protoc --elixir_out=gen_descriptors=true:compiled_protos n1_n2_conv.proto

Other names also produce the same error: 'An1_n2.proto', 'n1_n2A.proto', 'n1n2.proto'.

Compile the proto to java does not fail:

$> protoc --java_out=compiled_protos n1_n2.proto

Right now, I have a workaround by renaming it to 'n1_n2_conv.proto', but this is a very strange error.

Thanks for your great work.