[Issue 12990] utf8 string not read/written to windows console

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12990

--- Comment #2 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
import std.stdio, std.utf;

void main()
{
  string s = stdin.readln();
  validate(s);
  write(s);
}

Check if validation passes.

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