[JS] Invalid codegen

[dawkot]

Example

proc foo =
  var x: seq[seq[int]]
  for row in x.mitems:
    let i = 1
    inc row[i-1]

foo()

Current Output

Uncaught SyntaxError: Invalid left-hand side in assignment

(Tmp4 = row_42215[row_42215_Idx][chckIndx(subInt(i_42217, 1), 0, row_42215[row_42215_Idx].length+0-1)-0], Tmp4) = addInt(Tmp4, 1);

Expected Output

No errors

Additional Information

$ nim -v
Nim Compiler Version 1.0.2

[metagn]

Reduces to

var x: seq[seq[int]]
let i = 1
inc x[0][i-1]

So iterators label can be removed.