message: Replace "be the i32 type" with "be an i32" in error messages.
diff: @@ -148,7 +148,7 @@ impl LocalBacking {
  Initializer::Const(Value::I32(offset)) => offset as u32,
  Initializer::Const(_) => {
  return Err(vec![LinkError::Generic {
  - message: "a const initializer must be the i32 type".to_string(),
  + message: "a const initializer must be an i32".to_string(),
  }]);
  }
  Initializer::GetGlobal(import_global_index) => {
  @@ -209,7 +209,7 @@ impl LocalBacking {
  Initializer::Const(Value::I32(offset)) => offset as u32,
  Initializer::Const(_) => {
  return Err(vec![LinkError::Generic {
  - message: "a const initializer must be the i32 type".to_string(),
  + message: "a const initializer must be an i32".to_string(),
  }]);
  }
  Initializer::GetGlobal(import_global_index) => {
  @@ -282,7 +282,7 @@ impl LocalBacking {
  Initializer::Const(Value::I32(offset)) => offset as u32,
  Initializer::Const(_) => {
  return Err(vec![LinkError::Generic {
  - message: "a const initializer must be the i32 type".to_string(),
  + message: "a const initializer must be an i32".to_string(),
  }]);
  }
  Initializer::GetGlobal(import_global_index) => {
  @@ -340,7 +340,7 @@ impl LocalBacking {
  Initializer::Const(Value::I32(offset)) => offset as u32,
  Initializer::Const(_) => {
  return Err(vec![LinkError::Generic {
  - message: "a const initializer must be the i32 type".to_string(),
  + message: "a const initializer be an i32".to_string(),
  }]);
  }
  Initializer::GetGlobal(import_global_index) => {
  