varargs used in a tuple gives cgen error

[timotheecour]

Example

when true:
  proc fn(a, int, b: varargs[int]) =
    echo (a, b)
  fn(1)

Current Output

@mt12319.nim.c:210:32: error: passing 'tyVarargs__cLNJubUogBf9cxa9butXtOHQ' to parameter of incompatible type 'NI *' (aka 'long long *')
        T1_ = dollar__t4950514957_149(x, xLen_0);
                                      ^
/Users/timothee/git_clone/nim/timn/build/nimcache/@mt12319.nim.c:195:70: note: passing argument to parameter 'x' here
N_LIB_PRIVATE N_NIMCALL(NimStringDesc*, dollar__t4950514957_149)(NI* x, NI xLen_0) {
                                                                     ^
/Users/timothee/git_clone/nim/timn/build/nimcache/@mt12319.nim.c:234:39: error: passing 'NI *' (aka 'long long *') to parameter of incompatible type 'tyVarargs__cLNJubUogBf9cxa9butXtOHQ'
        addQuoted_t4950514957_143((&result), x.Field0.Field0, x.Field0.Field1);

Expected Output

give CT error

Additional Information

cgen error in 1.5.1 7f077a7
CT error in 1.0.0 (but maybe not the right one): dollars.nim(57, 9) Error: invalid type: 'varargs[int]' in this context: 'tuple of (varargs[int], varargs[int])'