lost_path.zig

const std = @import("std");

pub fn main() !void {
    const allocator = std.heap.c_allocator;

    const cwd = try std.process.getCwdAlloc(allocator);
    defer allocator.free(cwd);

    var paths = std.ArrayList([]const u8).init(allocator);
    {
        var dir = try std.fs.Dir.open(allocator, cwd);
        defer dir.close();
        // here, all the paths are fine
        while (try dir.next()) |entry| {
            std.debug.warn("appending file: '{}'\n", entry.name);
            try paths.append(entry.name);
        }
    }
    std.debug.warn("\n");
    const paths_done = paths.toSliceConst();
    // but here, the first one will be blank/empty
    // something to do with running the defer on line 12 (dir.close())
    for (paths_done) |path| {
        std.debug.warn("(after dir.close() has run), file: '{}'\n", path);
    }
}

// Run with: `zig run -l c lost_path.zig`
//
// This will output (on Zig 0.5.0, when cloned from gist.github.com, i.e. when there's a `.git` directory present):
//
// appending file: '.git'
// appending file: 'lost_path.zig'
//
// (after dir.close() has run), file: ''
// (after dir.close() has run), file: 'lost_path.zig'
//
// === End of output ===
//
// ^ The first path in the slice always ends up as an empty string. This
// happens seemingly as a result of running `dir.close()`