rust upgrade

Cargo.toml

@@ -4,7 +4,7 @@ version = "0.3.0"
 authors = ["Sagie Gur-Ari <sagiegurari@gmail.com>"]
 description = "File System and Path utility functions."
 license = "Apache-2.0"
-edition = "2018"
+edition = "2021"
 documentation = "https://sagiegurari.github.io/fsio/api/fsio/index.html"
 homepage = "http://github.com/sagiegurari/fsio"
 repository = "https://github.com/sagiegurari/fsio.git"

src/file.rs

@@ -219,7 +219,7 @@ pub fn append_file<T: AsPath + ?Sized>(path: &T, data: &[u8]) -> FsIOResult<()>
 /// ```
 pub fn modify_file<T: AsPath + ?Sized>(
     path: &T,
-    write_content: &Fn(&mut File) -> io::Result<()>,
+    write_content: &dyn Fn(&mut File) -> io::Result<()>,
     append: bool,
 ) -> FsIOResult<()> {
     directory::create_parent(path)?;

src/lib.rs

@@ -7,6 +7,7 @@
     asm_sub_register,
     bad_asm_style,
     bindings_with_variant_name,
+    break_with_label_and_loop,
     cenum_impl_drop_cast,
     clashing_extern_declarations,
     coherence_leak_check,
@@ -17,11 +18,15 @@
     const_item_mutation,
     dead_code,
     deprecated,
+    deprecated_cfg_attr_crate_type_name,
     deprecated_in_future,
+    deref_into_dyn_supertrait,
     deref_nullptr,
     drop_bounds,
+    duplicate_macro_attributes,
     dyn_drop,
     ellipsis_inclusive_range_patterns,
+    enum_intrinsics_non_enums,
     explicit_outlives_requirements,
     exported_private_dependencies,
     forbidden_lint_groups,
@@ -35,6 +40,7 @@
     indirect_structural_match,
     ineffective_unstable_trait_impl,
     inline_no_sanitize,
+    invalid_atomic_ordering,
     invalid_doc_attributes,
     invalid_type_param_default,
     invalid_value,
@@ -52,6 +58,7 @@
     mixed_script_confusables,
     mutable_borrow_reservation_conflict,
     mutable_transmutes,
+    named_asm_labels,
     no_mangle_const_items,
     no_mangle_generic_items,
     non_ascii_idents,
@@ -81,6 +88,8 @@
     soft_unstable,
     stable_features,
     temporary_cstring_as_ptr,
+    text_direction_codepoint_in_comment,
+    text_direction_codepoint_in_literal,
     trivial_bounds,
     trivial_casts,
     trivial_numeric_casts,
@@ -104,6 +113,7 @@
     unsupported_naked_functions,
     unused_allocation,
     unused_assignments,
+    unused_assignments,
     unused_attributes,
     unused_braces,
     unused_comparisons,
@@ -122,7 +132,9 @@
     unused_qualifications,
     unused_unsafe,
     unused_variables,
-    useless_deprecated
+    useless_deprecated,
+    where_clauses_object_safety,
+    while_true
 )]
 #![warn(macro_use_extern_crate, unknown_lints)]
 #![allow(