"The handle is invalid" running inside Cygwin on Windows 10

[AlbertoGP]

Hi, this combination might be out of scope but I can spend some time helping diagnose it.

Compiling in Windows 10, the program runs fine under PowerShell and CMD.EXE, but crashes when run from the Cygwin console:

$ cargo run
   Compiling lf v0.1.0 (C:\cygwin\home\user\linefeed-crash)
warning: variable does not need to be mutable
  --> src\main.rs:13:7
   |
13 |   let mut reader = Interface::new("my-application")?;
   |       ----^^^^^^
   |       |
   |       help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: 1 warning emitted

    Finished dev [unoptimized + debuginfo] target(s) in 11.76s
     Running `target\debug\lf.exe`
Hello, world!
Error: Os { code: 6, kind: Other, message: "The handle is invalid." }

$

The error happens on line 13 of the attached file: let mut reader = Interface::new("my-application")?; main.rs.txt

Is this a known issue?

[AlbertoGP]

This might be a widespread problem: I’m checking alternatives, and for instance in rustyline it says:

Note: Mintty (Cygwin/MinGW) is not supported

Others don’t specify that. Two of them, Terminal Wizardry and Runtastic Prompt mention only that they support Windows, the others don’t say even that.

[AlbertoGP]

For easy reference, here are the problems with supporting Mintty in rustyline from their issue tracker:

There are at least two problems implementing the Term trait (mainly the input part):

• check is_stdin_tty
• and activate raw mode.

Under Mintty, you cannot use the Windows API anymore.

https://github.com/kkawakam/rustyline/issues/203#issuecomment-468934002