Fix detection of library events

slither/slithir/convert.py

@@ -827,7 +827,7 @@ def extract_tmp_call(ins: TmpCall, contract: Optional[Contract]):  # pylint: dis
             # lib L { event E()}
             # ...
             # emit L.E();
-            if str(ins.ori.variable_right) in ins.ori.variable_left.events_as_dict:
+            if str(ins.ori.variable_right) in [f.name for f in ins.ori.variable_left.events]:
                 eventcall = EventCall(ins.ori.variable_right)
                 eventcall.set_expression(ins.expression)
                 eventcall.call_id = ins.call_id

tests/ast-parsing/expected/library_event-0.8.16.sol-0.8.16-compact.json

@@ -0,0 +1,6 @@
+{
+  "Lib": {},
+  "Test": {
+    "foo()": "digraph{\n0[label=\"Node Type: ENTRY_POINT 0\n\"];\n0->1;\n1[label=\"Node Type: EXPRESSION 1\n\"];\n}\n"
+  }
+}

tests/ast-parsing/library_event-0.8.16.sol

@@ -0,0 +1,12 @@
+pragma solidity 0.8.16;
+
+library Lib {
+  event Event();
+}
+
+contract Test {
+  function foo() external {
+    emit Lib.Event(); // This line specifically
+  }
+}
+

tests/test_ast_parsing.py

@@ -424,6 +424,7 @@ def make_version(minor: int, patch_min: int, patch_max: int) -> List[str]:
     Test("free_functions/new_operator.sol", ["0.8.12"]),
     Test("free_functions/library_constant_function_collision.sol", ["0.8.12"]),
     Test("ternary-with-max.sol", ["0.8.15"]),
+    Test("library_event-0.8.16.sol", ["0.8.16"]),
 ]
 # create the output folder if needed
 try: