error[E0015]: cannot call non-const function `format` in statics --> $DIR/issue-64453.rs:4:31 | LL | static settings_dir: String = format!(""); | ^^^^^^^^^^^ | = note: calls in statics are limited to constant functions, tuple structs and tuple variants = note: consider wrapping this expression in `std::sync::LazyLock::new(|| ...)` = note: this error originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info) error[E0507]: cannot move out of static item `settings_dir` --> $DIR/issue-64453.rs:13:37 | LL | let settings_data = from_string(settings_dir); | ^^^^^^^^^^^^ move occurs because `settings_dir` has type `String`, which does not implement the `Copy` trait | help: consider cloning the value if the performance cost is acceptable | LL | let settings_data = from_string(settings_dir.clone()); | ++++++++ error: aborting due to 2 previous errors Some errors have detailed explanations: E0015, E0507. For more information about an error, try `rustc --explain E0015`.