once_cell 0.1.2

Single assignment cells and lazy static values without macros.
Documentation 
language: rust
rust:
  - stable
  - beta
  - 1.25.0

script:
  - cargo test
  - cargo test --release

matrix:
  include:
  - rust: beta
    script:
    - cargo test --no-default-features
    - cargo test --no-default-features --release