[BUG] Implicit move on non-last use

[JohelEGP]

Title: Implicit move on non-last use.

Minimal reproducer (https://cpp2.godbolt.org/z/z1nWesaaa):

main: () = {
  x := 0;

  if true { _ = x; }

  {
    { _ = x; }

    _ = x;
  }
}

Commands:

```bash cppfront main.cpp2 clang++18 -std=c++23 -stdlib=libc++ -lc++abi -pedantic-errors -Wall -Wextra -Wconversion -Werror=unused-result -Werror=unused-value -Werror=unused-parameter -Werror=unused-variable -I . main.cpp ```

Expected result:

    {static_cast<void>(x); }

    static_cast<void>(std::move(x));

Actual result and error:

    {static_cast<void>(std::move(x)); }

    static_cast<void>(std::move(x));

Cpp2 lowered to Cpp1:

```C++ //=== Cpp2 type declarations ==================================================== #include "cpp2util.h" #line 1 "/app/example.cpp2" //=== Cpp2 type definitions and function declarations =========================== #line 1 "/app/example.cpp2" auto main() -> int; //=== Cpp2 function definitions ================================================= #line 1 "/app/example.cpp2" auto main() -> int{ #line 2 "/app/example.cpp2" auto x {0}; if (true) {static_cast(x); } { {static_cast(std::move(x)); } static_cast(std::move(x)); } } ```

Output:

Program returned: 0

See also:

• 440.

Same for the test case of #869.

v: @union @print type = {
  i: int;
}

prints

        if that.is_i()
        {
            set_i(that.i());
        }

which generates

if (CPP2_UFCS(is_i)(std::move(that))) {set_i(CPP2_UFCS(i)(std::move(that)));}