Better error message

igraph · May 16, 2023 · efc8bec · efc8bec
1 parent eca0a0d
commit efc8bec
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Showing 2 changed files with 3 additions and 4 deletions.
diff --git a/R/versions.R b/R/versions.R
@@ -104,6 +104,9 @@ check_version <- function(graph) {
 }
 
 warn_version <- function(graph) {
+  # Calling for side effect: error if R_SEXP_to_igraph() fails
+  vcount_impl(graph)
+
   if (graph_version() != graph_version(graph)) {
     message(
       "This graph was created by an old(er) igraph version.\n",

diff --git a/tests/testthat/_snaps/old-data-type.md b/tests/testthat/_snaps/old-data-type.md
@@ -2,10 +2,6 @@
 
     Code
       V(karate)
-    Message <simpleMessage>
-      This graph was created by an old(er) igraph version.
-        Call upgrade_graph() on it to use with the current igraph version
-        For now we convert it on the fly...
     Error <simpleError>
       This graph was created by a now unsupported old igraph version.
         Call upgrade_version() before using igraph functions on that object.