REPL prompt disappears

[dhil]

I have noticed a regression in the REPL. The prompt (default links>) disappears after a complete enter keystroke.

For example:

links> 42; # enter keystroke here

Renders as

42;
42 : Int

The expected rendering is

links> 42;
42 : Int

[dhil]

I cannot rule out that it may be a problem with the particular terminal on my machine (bash 5.1.16(1)-release on Ubuntu 22.04.1). I can try on another machine later.

[jamescheney]

I'm not sure I understand the issue: it sounds like you are experiencing that the links> prompt is being shown initially, then you type 42;<Enter>, and after that the prompt that had already appeared disappears leaving just the 42;. Is that right? Or is it that subsequent links> prompts are not printed?

Using b04d184 on Mac OS 12.5.1, ocaml 4.13.1, I don't see this, after entering 42;<Enter> a few times I see:

links> 42;
42 : Int
links> 42;
42 : Int
links> 42;
42 : Int
links> 

[dhil]

Yeah, I am being shown links> initially, and then it disappears after an enter keystroke.

Interesting, so it may be a problem on this specific machine then. I am able to reproduce with both OCaml 4.14.1 and 5.0.0.

[jamescheney]

Hmm - what happens if you disable the fancy command line support? (native_readline=false)

[dhil]

It works as expected on my machine at home (same shell, same OS, same compilers). So it must be some problem with my other machine.