delete mode 100644 lib/build_runner.zig
 create mode 100644 lib/compiler/build_runner.zig
 create mode 100644 lib/compiler/fmt.zig
 create mode 100644 lib/compiler/reduce.zig
 create mode 100644 lib/compiler/reduce/Walk.zig
 create mode 100644 lib/compiler/test_runner.zig
 delete mode 100644 lib/std/zig/fmt.zig
 delete mode 100644 lib/std/zig/reduce.zig
 delete mode 100644 lib/std/zig/reduce/Walk.zig
 delete mode 100644 lib/test_runner.zig