Support for checking loaded descriptors agains an expected txt file

compiler/testData/lazyResolve/diagnostics/DiamondFunctionGeneric.txt

@@ -0,0 +1,17 @@
+namespace <root>
+
+internal open class Base</*0*/ P : jet.Any?> : jet.Any {
+    public final /*constructor*/ fun </*0*/ P : jet.Any?><init>(): Base<P>
+    internal final fun f(): jet.Int
+}
+internal final class Diamond</*0*/ P : jet.Any?> : Left<P>, Right<P> {
+    public final /*constructor*/ fun </*0*/ P : jet.Any?><init>(): Diamond<P>
+    internal final override /*2*/ fun f(): jet.Int
+}
+internal open class Left</*0*/ P : jet.Any?> : Base<P> {
+    public final /*constructor*/ fun </*0*/ P : jet.Any?><init>(): Left<P>
+    internal final override /*1*/ fun f(): jet.Int
+}
+internal abstract trait Right</*0*/ P : jet.Any?> : Base<P> {
+    internal final override /*1*/ fun f(): jet.Int
+}