delete mode 100644 std/fmt.zig
 create mode 100644 std/fmt/errol/enum3.zig
 create mode 100644 std/fmt/errol/index.zig
 create mode 100644 std/fmt/errol/lookup.zig
 create mode 100644 std/fmt/index.zig
 delete mode 100644 std/math.zig
 create mode 100644 std/math/fabs.zig
 create mode 100644 std/math/frexp.zig
 create mode 100644 std/math/index.zig
 create mode 100644 test/cases/bitcast.zig