Lightweight compile-time expression evaluation. This crate is inspired by Zig's comptime.

The expression returned by the contents of the comptime macro invocation will be parsed as Rust source code and inserted back into the call site.

Example

```rust

![feature(procmacrohygiene)]

fn main() { println!(concat!( "The program was compiled on ", comptime::comptime! { chrono::Utc::now().format("%Y-%m-%d").to_string() }, "." )); // The program was compiled on 2019-08-30. } ```