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doc: expand an error message about compacting closures #3627

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Mar 7, 2024
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doc: expand an error message about compacting closures #3627

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2 changes: 1 addition & 1 deletion src/runtime/compact.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
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