message: fix(runtime-core) Remove unnecessary implementation of `WasmTypeList`.
  The unit tests `test_func_arity_*` covers all possibilities, from 0 to
  12. Removing this specific implementation of `WasmTypeList` for `(A,)`
  doesn't break the test cases.
  Also, the `impl_traits!` macro already implement `WasmTypeList` for
  `(A,)` with `impl_traits!([transparent] S1, A)`. It's not clear why
  `rustc` doesn't detect that though.
diff: @@ -343,87 +343,6 @@ impl WasmTypeList for Infallible {
  }
  }
  -impl<A> WasmTypeList for (A,)
  -where
  - A: WasmExternType,
  -{
  - type CStruct = S1<A>;
  - type RetArray = [u64; 1];
  -
  - fn from_ret_array(array: Self::RetArray) -> Self {
  - (WasmExternType::from_native(NativeWasmType::from_binary(
  - array[0],
  - )),)
  - }
  -
  - fn empty_ret_array() -> Self::RetArray {
  - [0u64]
  - }
  -
  - fn from_c_struct(c_struct: Self::CStruct) -> Self {
  - let S1(a) = c_struct;
  - (WasmExternType::from_native(a),)
  - }
  -
  - fn into_c_struct(self) -> Self::CStruct {
  - #[allow(unused_parens, non_snake_case)]
  - let (a,) = self;
  - S1(WasmExternType::to_native(a))
  - }
  -
  - fn types() -> &'static [Type] {
  - &[A::Native::TYPE]
  - }
  -
  - #[allow(non_snake_case)]
  - unsafe fn call<Rets>(
  - self,
  - f: NonNull<vm::Func>,
  - wasm: Wasm,
  - ctx: *mut vm::Ctx,
  - ) -> Result<Rets, RuntimeError>
  - where
  - Rets: WasmTypeList,
  - {
  - let (a,) = self;
  - let args = [a.to_native().to_binary()];
  - let mut rets = Rets::empty_ret_array();
  - let mut trap = WasmTrapInfo::Unknown;
  - let mut user_error = None;
  -
  - if (wasm.invoke)(
  - wasm.trampoline,
  - ctx,
  - f,
  - args.as_ptr(),
  - rets.as_mut().as_mut_ptr(),
  - &mut trap,
  - &mut user_error,
  - wasm.invoke_env,
  - ) {
  - Ok(Rets::from_ret_array(rets))
  - } else {
  - if let Some(data) = user_error {
  - Err(RuntimeError::Error { data })
  - } else {
  - Err(RuntimeError::Trap {
  - msg: trap.to_string().into(),
  - })
  - }
  - }
  - }
  -}
  -
  -impl<'a, A: WasmExternType, Rets> Func<'a, (A,), Rets, Wasm>
  -where
  - Rets: WasmTypeList,
  -{
  - /// Call wasm function and return results.
  - pub fn call(&self, a: A) -> Result<Rets, RuntimeError> {
  - unsafe { <A as WasmTypeList>::call(a, self.func, self.inner, self.vmctx) }
  - }
  -}
  -
  macro_rules! impl_traits {
  ( [$repr:ident] $struct_name:ident, $( $x:ident ),* ) => {
  /// Struct for typed funcs.
  