Add unit test

tests/unit/src/unit/issues/Issue12149.hx

@@ -0,0 +1,48 @@
+package unit.issues;
+
+final class Vec {
+	public var x:Float;
+
+	public inline function new(x:Float)
+		this.x = x;
+}
+
+final class Rect {
+	public var top_left:Vec;
+
+	public inline function new(top_left:Vec)
+		this.top_left = top_left;
+}
+
+enum Shape {
+	Vec(v:Vec);
+}
+
+interface BodyInt {
+	function shape():Shape;
+}
+
+
+class Body implements BodyInt {
+	public inline function shape():Shape {
+		throw new Rect(new Vec(1)).top_left;
+	}
+}
+
+class Issue12149 extends Test {
+	function test() {
+		noAssert();
+	}
+
+	static inline function update_entity<T:BodyInt>(body:T) {
+		switch body.shape() {
+			case Vec(v):
+				throw new Vec(new Vec(new Vec(v.x).x).x);
+			default:
+				throw "";
+		}
+	}
+	
+	static function set_pos(body:Body)
+		update_entity(body);
+}