nonzero-char 0.3.0

Implement NonZeroChar, like NonZeroU32
Documentation 
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name: Rust test

on:
  push:
    branches: ["main"]
  pull_request:
    branches: ["main"]

env:
  CARGO_TERM_COLOR: always

jobs:
  build-linux:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        include:
          - toolchain: stable
          - toolchain: nightly
          - toolchain: 1.89 # msrv
    steps:
      - uses: actions/checkout@v4
      - run: rustup default ${{ matrix.toolchain }}
      - run: rustup component add clippy
      - run: cargo +${{ matrix.toolchain }} doc
      - run: cargo +${{ matrix.toolchain }} test --no-fail-fast
      - run: cargo +${{ matrix.toolchain }} clippy -- -D warnings
      - run: rm -v Cargo.lock
      - run: cargo +${{ matrix.toolchain }} doc
      - run: cargo +${{ matrix.toolchain }} test --no-fail-fast
      - run: cargo +${{ matrix.toolchain }} clippy -- -D warnings