Unreported "illegal reference to static field from initializer" in relation to javac

org.eclipse.jdt.core.compiler.batch/src/org/eclipse/jdt/internal/compiler/lookup/MethodScope.java

@@ -557,8 +557,13 @@ public boolean isLambdaScope() {
 }
 
 public boolean isInsideInitializerOrConstructor() {
-	return (this.referenceContext instanceof TypeDeclaration)
-		|| (this.referenceContext instanceof ConstructorDeclaration);
+	// Peel away any intervening lambda(s) so they don't obscure initialization context
+	Scope scope = this;
+	while (scope.isLambdaScope())
+		scope = scope.parent;
+
+	return scope instanceof MethodScope mscope ?
+			mscope.referenceContext instanceof TypeDeclaration || mscope.referenceContext instanceof ConstructorDeclaration : false;
 }
 
 /**

org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/EnumTest.java

@@ -7433,4 +7433,40 @@ void k() {
 			"Cannot make a static reference to the non-static field h\n" +
 			"----------\n");
 }
+// https://github.com/eclipse-jdt/eclipse.jdt.core/issues/1590
+// Unreported "illegal reference to static field from initializer" in relation to javac
+public void testGHIssue1590() {
+	this.runNegativeTest(new String[] {
+			"X.java",
+			"""
+			import java.util.function.Supplier;
+
+			enum MyEnum {
+			;
+
+			    private static MyEnum selected;
+
+			    private MyEnum() {
+			        Supplier<MyEnum> s = () -> selected = this;
+			    }
+			}
+
+			enum S {
+				G(), B(), U();
+				S s=G;
+			}
+			"""
+			},
+			"----------\n" +
+			"1. ERROR in X.java (at line 9)\n" +
+			"	Supplier<MyEnum> s = () -> selected = this;\n" +
+			"	                           ^^^^^^^^\n" +
+			"Cannot refer to the static enum field MyEnum.selected within an initializer\n" +
+			"----------\n" +
+			"2. ERROR in X.java (at line 15)\n" +
+			"	S s=G;\n" +
+			"	    ^\n" +
+			"Cannot refer to the static enum field S.G within an initializer\n" +
+			"----------\n");
+}
 }