const_if_match - The Rust Unstable Book

# `const_if_match`

The tracking issue for this feature is: #49146

Allows for the use of conditionals (`if` and `match`) in a const context. Const contexts include `static`, `static mut`, `const`, `const fn`, const generics, and array initializers. Enabling this feature flag will also make `&&` and `||` function normally in a const-context by removing the hack that replaces them with their non-short-circuiting equivalents, `&` and `|`, in a `const` or `static`.