Inline anonymous type declarations

IDEHelper/Tests/src/Anonymous.bf

@@ -0,0 +1,44 @@
+using System;
+namespace Tests;
+
+class Anonymous
+{
+	struct StructA
+	{
+		public [Union] struct { public int mX, mY; } mVals;
+
+		[CRepr, SkipCall] struct { public int mA, mB; } GetVals()
+		{
+			decltype(GetVals()) retVals;
+			retVals.mA = 1;
+			retVals.mB = 2;
+			return retVals;
+		}
+	}
+
+	struct StructB
+	{
+		[Union]
+		public using struct
+		{
+			public int mX;
+			public int mY;
+		} mCoords;
+	}
+
+	[Test]
+	public static void TestBasics()
+	{
+		StructA sa = default;
+		sa.mVals.mX = 123;
+		Test.Assert(sa.mVals.mY == 123);
+		
+		var val = sa.[Friend]GetVals();
+		Test.Assert(val.mA == 0);
+		Test.Assert(val.mB == 0);
+
+		StructB sb = default;
+		sb.mX = 345;
+		Test.Assert(sb.mY == 345);
+	}
+}