R Under development (unstable) (2023-12-13 r85679 ucrt) -- "Unsuffered Consequences"
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> 
>  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)))
$nind
[1] 42

$nnode
[1] 4

$pred
[1] 0 1 2 3

$fam
[1] 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)))
Error: 'nind' must be positive integer
> 
>  .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)))
Error: 'nnode' must be positive integer
> 
>  .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)))
Error: pred[2] = 2, invalid
> 
>  .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)))
Error: family 25 not valid
> 
> 
> proc.time()
   user  system elapsed 
   0.10    0.06    0.15