Parsing compiler output not working

[v-tr]

When using the @compiler and @error_format directive, the error output of the used compiler is not parsed.

Build

Build from HEAD (6a9a3af) using ldc2 on MacOS/arm64

Observed Behavior

When running lit -c hello.lit on

@code_type lua .lua
@comment_type -- %s
@compiler lit hello.lit && luacheck --formatter plain hello.lua
@error_format %f:%l:%s: %m

@title Hello World

@s Hello world program

--- hello.lua
local msg = "Hello World"

@{print msg}
---

@s printing

--- print msg
print(msg)
end
---

the output remains

lit hello.lit && luacheck --formatter plain hello.lua
hello.lua:6:1: expected <eof> near 'end'

which is the unparsed output of hte luacheck command.

Expected Behavior

Parsing and translating the filename and line number in the output

lit hello.lit && luacheck --formatter plain hello.lua
hello.lit:20:1: expected <eof> near 'end'

[v-tr]

Using this example, which should use the build-in error format for clang leads to a comparable result

@compiler lit hello.lit && clang hello.c
@title Hello world in C

@s Introduction

This is an example hello world C program.
We can define codeblocks with `---`

--- hello.c
@{Includes}

int main() {
    @{Print a string}
    return 0;
    b = 5;
}
---

Now we can define the `Includes` codeblock:

--- Includes
#include <stdio.h>
---

Finally, our program needs to print "hello world"

--- Print a string
printf("hello world\n");
---

lit hello.lit && clang hello.c
hello.c:8:5: error: use of undeclared identifier 'b'
    b = 5;
    ^
1 error generated.