import os

    text := os.read_file('app.log') or {
        eprintln('failed to read the file: ${err}')
        return
    }

    lines := text.split_into_lines()
    for line in lines {
        if line.starts_with('DEBUG:') {
            println(line)
        }
    }

Code after that won't run at all.

> ...memory safety through its “autofree” memory feature

V has different memory management options, which can be turned off and the libraries don't depend on them. GC (default and optional), autofree, arena allocator (prealloc), or manual. This is mentioned in the documentation (https://github.com/vlang/v/blob/master/doc/docs.md). It has numerous safety features, as part of its design, and coupled with the GC (default) or autofree, would provide significant memory safety.