R Under development (unstable) (2024-09-21 r87186 ucrt) -- "Unsuffered Consequences"
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> library(supc)
> supc:::.set_num_threads(2)
> wrong.dist <- function(x) {
+   x[] <- 0
+   stats::dist(x)
+ }
> X <- structure(
+   c(-0.125290762148466, 2.03672866484442, 0.832874277517991,  6.31905616042756, 8.06590155436307, 6.8359063231764,
+     3.0974858104857,  5.14766494102584, 4.1151562703307, 0.164244239019618, 2.1187802642435,  1.18379547432164,
+     6.15642726014621, 8.01491299667304, 6.60212966082732,  3.12396514957894, 4.9887742520942, 3.96884089865893,
+     -0.0788579907420699,  1.98813732065776, 1.22000507439678, 6.15263514969151, 7.96709528074928,  6.9493276639727,
+     3.13939267508095, 5.11133263973473, 3.8622488610901,  -0.0610776774312712, 0.30235623369017, 1.07796864728229,
+     -0.124248116108361,  -0.4429399774355, 1.22498618362862, 2.99101327819695, 2.99676194738021,  4.18876724213706,
+     -0.294150476779855, -0.0956300110217241, 1.08358831203994,  0.271735910305809, -0.0205575454685991, 1.07753432231187,
+     2.98923899188342,  2.72458808863428, 3.91700108734006, -0.141499031392424, 0.0729163924273661,  1.15370658490308,
+     -0.0224692424300456, 0.176221545290843, 1.07962117607341,  2.87759472134985, 3.06822393828489, 3.77412738078384
+   ),
+   .Dim = c(27L,  2L)
+ )
> dist.mode("wrong", wrong.dist)
> g2 <- supc1(X, r = .9, t = .75, implementation = "R")
> stopifnot(g2$iteration == 2)
> stopifnot(max(g2$cluster) == 1) # because all distance is zero, so there is only one cluster
> 
> proc.time()
   user  system elapsed 
   0.28    0.07    0.34