Nothing
       library(aster)
 aster:::setfam(fam.default())
 .C(aster:::C_aster_check_model,
     nind = as.integer(42),
     nnode = as.integer(4),
     pred = as.integer(c(0, 1, 2, 3)),
     fam = as.integer(c(1, 1, 2, 3)))
 options(error=dump.frames)
 .C(aster:::C_aster_check_model,
     nind = as.integer(0),
     nnode = as.integer(4),
     pred = as.integer(c(0, 1, 2, 3)),
     fam = as.integer(c(1, 1, 2, 3)))
 .C(aster:::C_aster_check_model,
     nind = as.integer(42),
     nnode = as.integer(-3),
     pred = as.integer(c(0, 1, 2, 3)),
     fam = as.integer(c(1, 1, 2, 3)))
 .C(aster:::C_aster_check_model,
     nind = as.integer(42),
     nnode = as.integer(4),
     pred = as.integer(c(0, 2, 2, 3)),
     fam = as.integer(c(1, 1, 2, 3)))
 .C(aster:::C_aster_check_model,
     nind = as.integer(42),
     nnode = as.integer(4),
     pred = as.integer(c(0, 1, 2, 3)),
     fam = as.integer(c(1, 1, 2, 25)))
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