allow-until

Allows an item until a specified semver version, and then errors on compilation.

![github] ![crates-io] ![docs-rs]

```rust

[allow_until(version = ">= 1.0.x", reason = "struct is deprecated from version 1.0.x onwards")]

struct MyStruct { //.... } ```

Or with the derive macro:

```rust

[derive(AllowUntil)]

struct MyStruct { #[allow_until(version = ">= 1.0.x", reason = "member is deprecated from version 1.0.x onwards")] foo: usize } ```

Once the CARGO_PKG_VERSION matches the given semver predicate, the macro will cause a compilation error, therefore reminding you to update/remove the code.