Dependency loop detected when depending on custom Build step

[smokku]

Zig Version

0.11.0-dev.1913+95f6a5935

Steps to Reproduce and Observed Behavior

I'm trying to write a custom build step (that generates compile_commands.json).

With the following zig.build file (reduced to a minimum reproduction)

const std = @import("std");

pub fn build(b: *std.Build) void {
    var cdb_file_step = std.Build.Step.init(.custom, "cdb_file", b.allocator, makeCdb);
    const cdb_step = b.step("cdb", "Create compile_commands.json");
    cdb_step.dependOn(&cdb_file_step);
}

fn makeCdb(_: *std.Build.Step) !void {
    std.debug.print("./compile_commands.json\n", .{});
}

build fails with

> zig build cdb

error: Dependency loop detected:
  thread 1769174 panic: reached unreachable code
/home/smoku/.zig/0.11.0-dev.1913+95f6a5935/files/lib/std/os.zig:1137:23: 0x265cc4 in write (build)
            .FAULT => unreachable,
                      ^
/home/smoku/.zig/0.11.0-dev.1913+95f6a5935/files/lib/std/fs/file.zig:1131:33: 0x265ada in write (build)
            return os.write(self.handle, bytes);
                                ^
/home/smoku/.zig/0.11.0-dev.1913+95f6a5935/files/lib/std/io/writer.zig:17:32: 0x269848 in write (build)
            return writeFn(self.context, bytes);
                               ^
/home/smoku/.zig/0.11.0-dev.1913+95f6a5935/files/lib/std/io/writer.zig:23:46: 0x25c52e in writeAll (build)
                index += try self.write(bytes[index..]);
                                             ^
/home/smoku/.zig/0.11.0-dev.1913+95f6a5935/files/lib/std/fmt.zig:1058:28: 0x295ef6 in formatBuf__anon_9198 (build)
        try writer.writeAll(buf);
                           ^
/home/smoku/.zig/0.11.0-dev.1913+95f6a5935/files/lib/std/fmt.zig:656:45: 0x2693cd in formatType__anon_7060 (build)
                            return formatBuf(value, options, writer);
                                            ^
[...]

Expected Behavior

Running zig build cdb should echo ./compile_commands.json

> zig build cdb
./compile_commands.json