add Default impl to Stack

Author: Robbepop

crates/wasmi/src/engine/translator/stack2/consts.rs

@@ -1,2 +1,2 @@
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone)]
 pub struct ConstRegistry {}

crates/wasmi/src/engine/translator/stack2/locals.rs

@@ -1,7 +1,7 @@
 use crate::core::ValType;
 use alloc::vec::Vec;
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone)]
 pub struct LocalsRegistry {
     groups: Vec<LocalGroup>,
     len_locals: usize,

crates/wasmi/src/engine/translator/stack2/mod.rs

@@ -6,8 +6,8 @@ use crate::core::{TypedVal, ValType};
 use alloc::vec::Vec;
 use core::num::NonZeroUsize;
 
-#[derive(Debug, Clone)]
 /// The Wasm value stack during translation from Wasm to Wasmi bytecode.
+#[derive(Debug, Default, Clone)]
 pub struct Stack {
     /// The stack of operands.
     operands: Vec<StackOperand>,