Merge pull request #8607 from a3d4/fix-nested-tuples

Fixed nested tuples on the right-hand side.

test/libsolidity/semanticTests/types/nested_tuples_noyul.sol

@@ -0,0 +1,17 @@
+contract test {
+    function f3() public returns(int) {
+        int a = 3;
+        ((, ), ) = ((7, 8), 9);
+        return a;
+    }
+    function f4() public returns(int) {
+        int a;
+        (a, ) = (4, (8, 16, 32));
+        return a;
+    }
+}
+// ====
+// compileViaYul: false
+// ----
+// f3() -> 3
+// f4() -> 4

test/libsolidity/semanticTests/types/tuple_assign_multi_slot_grow.sol

@@ -0,0 +1,13 @@
+contract C {
+
+	function f() public pure returns (uint, uint, uint) {
+		bytes memory a; bytes memory b; bytes memory c;
+		(a, (b, c)) = ("0", ("1", "2"));
+		return (uint8(a[0]), uint8(b[0]), uint8(c[0]));
+	}
+
+}
+// ====
+// compileViaYul: also
+// ----
+// f() -> 0x30, 0x31, 0x32