rust/compiler/rustc_error_messages/locales/en-US/const_eval.ftl

const-eval-unstable-in-stable =
    const-stable function cannot use `#[feature({$gate})]`
    .unstable-sugg = if it is not part of the public API, make this function unstably const
    .bypass-sugg = otherwise `#[rustc_allow_const_fn_unstable]` can be used to bypass stability checks

const-eval-thread-local-access =
    thread-local statics cannot be accessed at compile-time