Fix .push() not considering external functions

Changelog.md

@@ -13,6 +13,7 @@ Bugfixes:
  * Antlr Grammar: Allow builtin names in ``yulPath`` to support ``.address`` in function pointers.
  * Control Flow Graph: Perform proper virtual lookup for modifiers for uninitialized variable and unreachable code analysis.
  * Immutables: Fix wrong error when the constructor of a base contract uses ``return`` and the parent contract contains immutable variables.
+ * IR Generator: Fix IR syntax error when copying storage arrays of structs containing functions.
  * Natspec: Fix ICE when overriding a struct getter with a Natspec-documented return value and the name in the struct is different.
  * TypeChecker: Fix ICE when a constant variable declaration forward references a struct.
 

libsolidity/codegen/YulUtilFunctions.cpp

@@ -3608,7 +3608,7 @@ string YulUtilFunctions::copyStructToStorageFunction(StructType const& _from, St
 				auto const& [srcSlotOffset, srcOffset] = _from.storageOffsetsOfMember(structMembers[i].name);
 				t("memberOffset", formatNumber(srcSlotOffset));
 				if (memberType.isValueType())
-					t("read", readFromStorageValueType(memberType, srcOffset, false));
+					t("read", readFromStorageValueType(memberType, srcOffset, true));
 				else
 					solAssert(srcOffset == 0, "");
 

test/libsolidity/semanticTests/viaYul/copy_struct_invalid_ir_bug.sol

@@ -0,0 +1,28 @@
+contract C {
+	struct Struct {
+		function () external el;
+	}
+	Struct[] array;
+	int externalCalled = 0;
+
+	function ext() external {
+		externalCalled++;
+	}
+
+	function f() public {
+		array.push(Struct(this.ext));
+		array.push(array[0]);
+
+		array[0].el();
+		array[1].el();
+
+		assert(externalCalled == 2);
+	}
+}
+// ====
+// compileViaYul: also
+// ----
+// f() ->
+// gas irOptimized: 113142
+// gas legacy: 112937
+// gas legacyOptimized: 112608