`IEC_ARRAY_1D` brace-initializer fails template deduction when integer literals span more than one C++ rank

[dreamclass]

Problem

Summary

When an array variable is initialized from a brace list of integer literals
whose values span more than one C++ integer rank (some fit in int, some
require long/long long), the generated IEC_ARRAY_1D constructor call fails
template argument deduction. strucpp codegen succeeds, but the resulting C++
does not compile.

Environment

• STruC++ version: 0.6.2, runtime iec_array.hpp
• C++ compiler: g++ (MSYS2 UCRT64) 15.1.0, -std=c++17

Impact

Compilation fails.

Reproduction

arr1d.st:

FUNCTION_BLOCK FB
VAR
    seeds : ARRAY [0..3] OF UDINT := [5489, 1301868182, 2938499221, 2950281878];
END_VAR
END_FUNCTION_BLOCK

PROGRAM PLC_PRG
VAR
    inst : FB;
    r : UDINT;
END_VAR
    inst();
    r := inst.seeds[0];
END_PROGRAM

strucpp arr1d.st -o arr1d.cpp --no-default-libs
g++ -std=c++17 -I<strucpp>/runtime/include -c arr1d.cpp

(2938499221 and 2950281878 exceed INT_MAX; 5489 does not.)

Actual result

strucpp reports Compilation successful! and emits, in the FB constructor:

: SEEDS({5489, 1301868182, 2938499221, 2950281878})

g++ then fails:

arr1d.cpp:57:7: error: no matching function for call to
  'strucpp::IEC_ARRAY_1D<strucpp::IECVar<unsigned int>, strucpp::ArrayBounds<0, 3> >
   ::IEC_ARRAY_1D(<brace-enclosed initializer list>)'
   57 |     : SEEDS({5489, 1301868182, 2938499221, 2950281878})
iec_array.hpp:63: note: candidate: 'template<class U> IEC_ARRAY_1D(std::initializer_list<U>)'
iec_array.hpp:63: note:   template argument deduction/substitution failed:
arr1d.cpp:57: note:   deduced conflicting types for parameter '_Tp' ('int' and 'long long int')

std::initializer_list<U> must deduce a single U; because 5489 is typed
int and the larger values are typed long long, deduction fails.

Code Locations

No response

Fix

No response

Acceptance

The array constant compiles regardless of the individual literals' natural C++
ranks — every element belongs to the array's declared element type (UDINT).