tuple codegen error

[timotheecour]

tuples give codegen error

Example

const a = $("a", "b")
proc fun() =
  const str = $int # ditto with import std/typetraits and `const str = name(T)` for a type T, 
  let b = $(str, "asdf")

fun()

Current Output

nim cpp main.nim

@mt0792.nim.c:100:39: error: passing 'const tyTuple__ZQxPyw7zPWZWYS61MfQJzw' (aka 'const struct tyTuple__ZQxPyw7zPWZWYS61MfQJzw') to parameter of incompatible type 'tyTuple__UV3llMMYFckfui8YMBuUZA' (aka 'struct tyTuple__UV3llMMYFckfui8YMBuUZA')
        b = dollar___QX30i9a0JRHUXu5QkLQcZiA(TM__lALVhCR9bMfGqd1f9ckszw0A_2);
                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/d04/@mt0792.nim.c:54:107: note: passing argument to parameter 'x' here
N_LIB_PRIVATE N_NIMCALL(NimStringDesc*, dollar___QX30i9a0JRHUXu5QkLQcZiA)(tyTuple__UV3llMMYFckfui8YMBuUZA x);

nim c main.nim

@mt0792.nim.cpp:99:6: error: no matching function for call to 'dollar___QX30i9a0JRHUXu5QkLQcZiA'
        b = dollar___QX30i9a0JRHUXu5QkLQcZiA(TM__lALVhCR9bMfGqd1f9ckszw0A_2);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/tmp/d04/@mt0792.nim.cpp:53:41: note: candidate function not viable: no known conversion from 'tyTuple__ZQxPyw7zPWZWYS61MfQJzw' to 'tyTuple__UV3llMMYFckfui8YMBuUZA' for 1st argument
N_LIB_PRIVATE N_NIMCALL(NimStringDesc*, dollar___QX30i9a0JRHUXu5QkLQcZiA)(tyTuple__UV3llMMYFckfui8YMBuUZA x);
                                        ^
/Users/timothee/git_clone/nim/Nim_devel/lib/nimbase.h:245:44: note: expanded from macro 'N_NIMCALL'
#  define N_NIMCALL(rettype, name) rettype name /* no modifier */

Expected Output

should work

Additional Information

• recent devel f22d3c7

workaround

looks like adding the (redundant-looking) string($foo) instead of $foo makes the codegen error go away

  const a = $("a", "b")
  proc fun() =
    const str = string($int)
    let b = $(str, "asdf")

  fun()