Cleaning language

crates/forth/src/vm.rs

@@ -559,7 +559,7 @@ impl Forth {
                 Op::Pick => {
                     let idx_i = stack.pop().ok_or("stack underflow")?.as_int()?;
                     if idx_i < 0 {
-                        return Err(format!("pick index must be >= 0, got {}", idx_i));
+                        return Err(format!("pick index must be >= 0, got {idx_i}"));
                     }
                     let idx = idx_i as usize;
                     let mut quots: Vec<Value> = Vec::new();