[Dev-luatex] tex.sp error handling

[Patrick Gundlach]

Hi,

if I understand things right, this code will not reach the second line.

  local ret = tex.sp("1cow")
  print(type(ret))

Instead, TeX stops (at least in my source code, I could have done something wrong) with "Illegal unit of measure (pt inserted)". Would it be possible to have some nicer error handling? For example to return [ nil, "Illegal unit of measure (pt inserted)"] ?

Patrick