[BUG] Wrong UFCS macro used outside declaration's initializer

[JohelEGP]

Title: Wrong UFCS macro used outside declaration's initializer.

Description:

See 827ed79#diff-e683e1259bbc0d6de7f1fbf797fb772f31a0a1ef2254ec317d15c298102fa3f3R2762-R2767.

Minimal reproducer (https://cpp2.godbolt.org/z/91TdsfKvv):

struct A {
  constexpr bool a() { return true; }
};
f: <T> (x: std::type_identity_t<decltype(T().a())>)
  -> std::type_identity_t<decltype(T().a())>
  requires T().a() = {
  return x;
}
main: () = f<A>(true);

Commands:

cppfront -clean-cpp1 main.cpp2
clang++17 -std=c++23 -stdlib=libc++ -lc++abi -pedantic-errors -Wall -Wextra -Wconversion -I . main.cpp

Expected result:

template<typename T> [[nodiscard]] auto f(cpp2::in<std::type_identity_t<decltype(CPP2_UFCS_0_NONLOCAL(a, T()))>> x) -> 
  std::type_identity_t<decltype(CPP2_UFCS_0_NONLOCAL(a, T()))>
requires (CPP2_UFCS_0_NONLOCAL(a, T()))

Actual result and error:

template<typename T> [[nodiscard]] auto f(cpp2::in<std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>> x) -> 
  std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>
requires (CPP2_UFCS_0(a, T()))

Cpp2 lowered to Cpp1:

#include "cpp2util.h"


struct A {
  constexpr bool a() { return true; }
};
template<typename T> [[nodiscard]] auto f(cpp2::in<std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>> x) -> 
  std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>; 

auto main() -> int;

template<typename T> [[nodiscard]] auto f(cpp2::in<std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>> x) -> 
  std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>
requires (CPP2_UFCS_0(a, T()))
  {
  std::ignore = x;
}
auto main() -> int { f<A>(true);  }

Output:

build/_cppfront/main.cpp:14:82: error: non-local lambda expression cannot have a capture-default
   14 | template<typename T> [[nodiscard]] auto f(cpp2::in<std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>> x) -> 
      |                                                                                  ^
raw.githubusercontent.com/hsutter/cppfront/main/include/cpp2util.h:706:2: note: expanded from macro 'CPP2_UFCS_0'
  706 | [&](auto&& obj) CPP2_FORCE_INLINE_LAMBDA -> decltype(auto) { \
      |  ^
build/_cppfront/main.cpp:15:33: error: non-local lambda expression cannot have a capture-default
   15 |   std::type_identity_t<decltype(CPP2_UFCS_0(a, T()))>
      |                                 ^
raw.githubusercontent.com/hsutter/cppfront/main/include/cpp2util.h:706:2: note: expanded from macro 'CPP2_UFCS_0'
  706 | [&](auto&& obj) CPP2_FORCE_INLINE_LAMBDA -> decltype(auto) { \
      |  ^
build/_cppfront/main.cpp:16:11: error: non-local lambda expression cannot have a capture-default
   16 | requires (CPP2_UFCS_0(a, T()))
      |           ^
raw.githubusercontent.com/hsutter/cppfront/main/include/cpp2util.h:706:2: note: expanded from macro 'CPP2_UFCS_0'
  706 | [&](auto&& obj) CPP2_FORCE_INLINE_LAMBDA -> decltype(auto) { \
      |  ^