Migrate to the 2021 edition of Rust

.github/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
           - channel: stable
             target: x86_64-pc-windows-msvc
             lint: true
-          - channel: '1.46'
+          - channel: '1.56'
             target: x86_64-pc-windows-msvc
             restrict_deps_versions: true
     env:
@@ -47,90 +47,18 @@ jobs:
         uses: actions-rs/cargo@v1
         with:
           command: generate-lockfile
-      - name: Restrict iana-time-zone version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package iana-time-zone --precise 0.1.54
-      - name: Restrict js-sys version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package js-sys --precise 0.3.50
-      - name: Restrict wasm-bindgen version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package wasm-bindgen --precise 0.2.84
-      - name: Restrict serde_bytes version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package serde_bytes --precise 0.11.10
-      - name: Restrict serde_json version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package serde_json --precise 1.0.72
-      - name: Restrict serde version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package serde --precise 1.0.156
-      - name: Restrict serde_derive version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package serde_derive --precise 1.0.156
       - name: Restrict chrono version
         if: matrix.restrict_deps_versions
         uses: actions-rs/cargo@v1
         with:
           command: update
-          args: --package chrono --precise 0.4.24
-      - name: Restrict quote version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package quote --precise 1.0.30
-      - name: Restrict proc-macro2 version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package proc-macro2 --precise 1.0.65
-      - name: Restrict windows-targets version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package windows-targets:0.48.5 --precise 0.48.5
-      - name: Restrict windows_x86_64_msvc version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package windows_x86_64_msvc:0.48.5 --precise 0.48.5
+          args: --package chrono --precise 0.4.26
       - name: Restrict libc version
         if: matrix.restrict_deps_versions
         uses: actions-rs/cargo@v1
         with:
           command: update
-          args: --package libc --precise 0.2.164
-      - name: Restrict num-traits version
-        if: matrix.restrict_deps_versions
-        uses: actions-rs/cargo@v1
-        with:
-          command: update
-          args: --package num-traits --precise 0.2.18
+          args: --package libc --precise 0.2.163
       - name: Setup Taplo
         if: matrix.lint
         uses: uncenter/setup-taplo@v1

Cargo.toml

@@ -1,6 +1,7 @@
 [package]
 name = "winreg"
-edition = "2018"
+edition = "2021"
+rust-version = "1.56"
 version = "0.53.0"
 authors = ["Igor Shaula <[email protected]>"]
 license = "MIT"