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doc: expand an error message about compacting closures (#3627)

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Provide a hint of where the error message may come from.
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Patrick Massot 2024-03-07 15:02:23 -05:00 • committed by GitHub
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src/runtime/compact.cpp
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@ -342,7 +342,7 @@ void object_compactor::operator()(object * o) {
g_tag_counters[lean_ptr_tag(curr)]++;
#endif
switch (lean_ptr_tag(curr)) {
case LeanClosure: lean_internal_panic("closures cannot be compacted");
case LeanClosure: lean_internal_panic("closures cannot be compacted. One possible cause of this error is trying to store a function in a persistent environment extension.");
case LeanArray: r = insert_array(curr); break;
case LeanScalarArray: insert_sarray(curr); break;
case LeanString: insert_string(curr); break;