"v run" unexpectedly terminates

[eayus]

Describe the bug

The following program has an infinite loop, and should not terminate. However v run main.v terminates without printing anything. This behaviour seems a bit suspicious, and differs from the behaviour if the program is compiled and ran (which segfaults, due to stack overflow).

Reproduction Steps

// main.v
fn forever() {
  forever()
}

fn main() {
  forever()
  
  println('hello world')
}

Run
v run main.v

Expected Behavior

v run to never terminate, or crash

Current Behavior

v run terminates, despite the program having an infinite loop.

Possible Solution

Imo the main thing is that the behaviour should be consistent. Ideally v run prints an error saying a stack overflow has occurred.

Additional Information/Context

No response

V version

Current V version: V 0.4.1 ed42341

Environment details (OS name and version, etc.)

Arch Linux, kernel 6.5.3

Important

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[JalonSolov]

It's definitely going to terminate, when you run out of stack. I'm just surprised you're not getting a message from the system about this.

[spytheman]

For me, v run x.v exits, with error code 11 .
v x.v then ./x exits with error code 139 and a message Segmentation fault (core dumped) .

[spytheman]

I think the main problem is that v run x.v just does not print the error message currently.

[spytheman]

#139 15:54:06 ᛋ master /space/v/vnew❱v -use-os-system-to-run run a.v 
Terminated by signal 139 (SIGSEGV)
#11 15:56:16 ᛋ master /space/v/vnew❱

This is when -use-os-system-to-run is used (i.e. os.system(), instead of os.new_process()) by v run .

[spytheman]

PR #19471 should fix this. With it:

#0 16:45:45 ᛋ v_run_show_more_details_on_program_terminated_by_a_signal /space/v/vnew❱v run /v/misc/2023_09_29__16/a.v
Terminated by signal 11 (SIGSEGV)
#139 16:45:50 ᛋ v_run_show_more_details_on_program_terminated_by_a_signal /space/v/vnew❱v -use-os-system-to-run run /v/misc/2023_09_29__16/a.v
Terminated by signal 11 (SIGSEGV)
#139 16:45:55 ᛋ v_run_show_more_details_on_program_terminated_by_a_signal /space/v/vnew❱./v /v/misc/2023_09_29__16/a.v
#0 16:46:05 ᛋ v_run_show_more_details_on_program_terminated_by_a_signal /space/v/vnew❱/v/misc/2023_09_29__16/a
Segmentation fault (core dumped)
#139 16:46:12 ᛋ v_run_show_more_details_on_program_terminated_by_a_signal /space/v/vnew❱