lent codegen error for c++ (works with c,js,vm)

[timotheecour]

lent codegen error for c++ (works with c,js,vm)

Example

when true: # D20201113T132829
  proc byLent[T](a: T): lent T = a
  let a = [11,12]
  doAssert byLent(a) == [11,12] # error: no matching function for call 

Current Output

@mt11278.nim.cpp:160:48: error: no matching function for call to 'byLent__YR8W5QF853QkzHxY0HJTiA'
                NIM_BOOL T3_ = eqeq___kPWPhCv4sxSS5oUvoHpOvQ(byLent__YR8W5QF853QkzHxY0HJTiA(a__9aK0EFj6IzQ9aQ33j9bVJ0VvA), TM__tQ8kc6yAWJgOgIMsVcTMMQ_2);
                                                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Users/timothee/git_clone/nim/timn/build/nimcache/@mt11278.nim.cpp:107:30: note: candidate function not viable: no known conversion from 'tyArray__HU7qaqKu9czJLT84iCBJnsA' (aka 'NI [2]') to 'tyArray__HU7qaqKu9czJLT84iCBJnsA *'
      (aka 'NI (*)[2]') for 1st argument; take the address of the argument with &
N_LIB_PRIVATE N_NIMCALL(NI*, byLent__YR8W5QF853QkzHxY0HJTiA)(tyArray__HU7qaqKu9czJLT84iCBJnsA* a) {
                             ^
/Users/timothee/git_clone/nim/Nim_devel/lib/nimbase.h:252:44: note: expanded from macro 'N_NIMCALL'
#  define N_NIMCALL(rettype, name) rettype name /* no modifier */

Expected Output

works

Additional Information

• devel 1.5.1 c39fa0d
• works with c, js, vm

eg:

when true:
  template main=
    proc byLent[T](a: T): lent T = a
    let a = [11,12]
    doAssert byLent(a) == [11,12]
  static: main() # ok
  main() # bug

• works with tuple instead of array:

when true:
  proc byLent[T](a: T): lent T = a
  let a2 = (11,)
  doAssert byLent(a2) == (11,)

• added disabled test case in strengthen taddr.nim: add test case for #14578; reference other issues; test cpp #15960